83376

Appears in sequences

• a(n) = n^2*(n^2+3)/4.at n=23A039623
• Counts of Kekulean pericondensed planar benzenoid hydrocarbons (see reference for precise definition).at n=6A141788
• a(n) = Sum_{d|n} C(n,d)*sigma(d)*sigma(n/d).at n=14A179307
• Number of ways to place 3 nonattacking grasshoppers on a toroidal chessboard of size n x n.at n=8A190398
• Expansion of e.g.f. log(1 + exp(x)*x*(1 + 7*x + 6*x^2 + x^3)).at n=6A306325
• Square array A(n,k), n >= 1, k >= 0, read by antidiagonals, where column k is the expansion of e.g.f. log(1 + Sum_{j>=1} j^k * x^j/j!).at n=50A308484
• L.g.f.: -log( Sum_{n=-oo..+oo} (-p)^n * (p*x)^(n^2) ) = Sum_{n>=1} a(n) * x^n/n, where p = sqrt(5).at n=6A337970