来自在线整数百科全书的问候语!http://oei.org/y*Search: id:a309974 Showing 1-1 of 1 %I A309974 %S A309974 1,1,1,6,3,3,1,4,4,12,2,3,2,12,5,8,2,5,4,16,4,6,2,10,6,18,3,6,3,17,7, %T A309974 13,3,7,5,20,7,10,3,10,7,22,6,9,3,13,9,25,5,8,4,18,11,20,4,8,5,26,11, %U A309974 17,4,9,7,28,11,13,4,11,9,30,9,12,4,15,11,32,7,11,4,21,12,33,6,11,5 %N A309974 a(1) = a(2) = a(3) = 1; a(n)=n(2×n-a(n-1)-a(n-2))/a(n-3)n> 3。n,a(n)n=1…10000的表%H A30974 Rey My SigRistor,前30000项的颜色散点图(where the color is function of n mod 6) %o A309974 (PARI) q=vector(100); q[1]=q[2]=q[3]=1; for(n=4, #q, q[n]=round((2*n-q[n-1]-q[n-2])/q[n-3])); q %o A309974 (MAGMA) I:=[1,1,1]; [n le 3 select I[n] else Round((2*n-Self(n-1)-Self(n-2))/Self(n-3)):n in [1..80]]; // _Marius A. Burtea_, Aug 25 2019 %Y A309974 Cf. A308622, A309971. %K A309974 nonn,简单,看%A30974,1,4%A30974Atutug AlGaANSand和R.Ey MigSigRig,8月25日2019‰内容在OEIS最终用户许可协议下可用:HTTP:/OEIS.Org/许可证