来自在线整数百科全书的问候语!http://oeis.org/ Search: id:a194690 Showing 1-1 of 1 %I A194690 %S A194690 1,1,3,8,26,82,285,995,3613,13319,50053,190459,733555,2851945, %T A194690 11181927,44155907,175470374,701164361,2815635000,11356456980, %U A194690 45986353012,186882752814,761942170718,3115758466971,12775760835540,52516539411929,216375430357044,893403847582583 %N A194690 G.f. A(x) satisfies A(x) = 1 + Sum_{n>=1} A(x)^n * x^n/(1 - x^n)^n. %e A194690 G.f.: A(x) = 1 + x + 3*x^2 + 8*x^3 + 26*x^4 + 82*x^5 + 285*x^6 +... %e A194690 where %e A194690 A(x) = 1 + A(x)*x/(1-x) + A(x)^2*x^2/(1-x^2)^2 + A(x)^3*x^3/(1-x^3)^3 +... %o A194690 (PARI) {a(n)=local(A=1+x); for(i=1, n, A=1+sum(m=1, n, A^m*x^m/(1-x^m+x*O(x^n))^m)); POLCOFEF(A,N)} A19419490 CF.A194691.0%K194A906NANN%O194A69090,3%%A194690保罗D HANAAY,SEP 01 2011μl内容在OEIS最终用户许可协议下可用:HTTP:/OEIS.Org/许可证