39045

Appears in sequences

• a(n) = Sum_{k=0..n} T(n,k) * T(n,2n-k), with T given by A027113.at n=8A027135
• G.f.: exp( Sum_{n>=1} 6 * A084214(n) * x^n/n ) where g.f. of A084214 is (1+x^2)/((1+x)*(1-2*x)).at n=8A182349
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of the symmetric matrix A203001; by antidiagonals.at n=33A203002
• Number of partitions of n into at most 1^2 copy of 1, 2^2 copies of 2, 3^2 copies of 3, ... .at n=49A303944
• a(n) is the number of unlabeled rank-3 graded lattices with 5 coatoms and n atoms.at n=15A322600