来自在线整数百科全书的问候语!http://oeis.org/ Search: id:a160731 Showing 1-1 of 1 %I A160731 %S A160731 2,2,4,6,6,6,12,14,12,6,12,14,16,18,32,34,20,6,12,14,16,18,32,34,24, %T A160731 18,32,38,44,62,92,82,36,6,12,14,16,18,32,34,24,18,32,38,44,62,92,82, %U A160731 40,18,32,38,44,62 %N A160731 First differences of A160730. %H A160731 David Applegate, Omar E. Pol and N. J. A. Sloane,基于细胞自动机的牙签序列及其他序列国会议员,第206卷(2010),157—191页。[定理6中有一个类型:(13)应该读取u(n)=4.3 ^(Wt(n-1)-1),对于n>=2。] %h,A160731,N.J.A.斯隆,OEIS中的Toothpick目录和元胞自动机序列%F A160731 Contribution from Nathaniel Johnston, Mar 28 2011 (Start): %F A160731 a(n) = 2*A168113(n) %F A160731 a(2^(n+2) + 1) = 4(2^n + 1), n >= 1. %F A160731 (End) %e A160731 Placing the entries starting from a(4) in a triangle with rows that have length equal to powers of two gives: %e A160731 6, 6 %e A160731 6, 12, 14, 12 %e A160731 6, 12, 14, 16, 18, 32, 34, 20 %e A160731 6, 12, 14, 16, 18, 32, 34, 24, 18, 32, 38, 44, 62, 92, 82, 36 %e A160731 ... %e A160731 The rows of this triangle tend to 2*A168114. %Y A160731 Cf. A139250, A139251, A160730, A160733, A160737, A160739, A160741. %K A160731 nonn %O A160731 1,1 %A A160731 _Omar E. Pol_, May 25 2009 %E A160731 Terms after a(11) from _Nathaniel Johnston_, Mar 28 2011 # Content is available under The OEIS End-User License Agreement: http://oeis.org/LICENSE