557568

Appears in sequences

• Theta series of laminated lattice LAMBDA_10.at n=15A006909
• a(n) = A027144(2n, n-2).at n=7A027147
• Expansion of (theta_3(z^4)^3 + theta_2(z^4)^3)^4.at n=26A028697
• a(1) = 1, a(2) = 2, next terms up to a(2n-1) are obtained by multiplying previous terms a(n-1) by n+1, a(n-2) by n+2 etc. a(2) by (2n-2) and a(1) by 2n-1. On similar lines a(2n) = 2n*a(2n-2), a(2n+1) = (2n+1)*a(2n-1) and so on.at n=43A109844
• a(n) = n^2*(n+1)^2/2.at n=32A163102
• Intersection of A001694 and A195069.at n=28A316499