40921

Appears in sequences

• a(n) = Sum_{k=0..n} (-1)^(n-k)*A000041(k).at n=44A087787
• For a given unrestricted partition pi, let P(pi)=lambda(pi), if mu(pi)=0. If mu(pi)>0 then let P(pi)=nu(pi), where nu(pi) is the number of parts of pi greater than mu(pi), mu(pi) is the number of ones in pi and lambda(pi) is the largest part of pi.at n=43A100818
• a(n) = 1 + (6 + (11 + (6 + n)*n)*n)*n/24.at n=30A145126
• Number of 2's in the last section of the set of partitions of n.at n=46A182712
• Number of 2's in all partitions of 2n that do not contain 1 as a part.at n=23A182716
• Expansion of (1+x)/(1-x^2-3*x^5).at n=32A238391
• Number of partitions p of n such that floor(mean(p)) and ceiling(mean(p)) are parts of p.at n=47A241340