90546

Appears in sequences

• Eight bishops and one elephant on a 3 X 3 chessboard: a(n) = 2*Pell(n+1)+2*Pell(n)-2^n, with Pell = A000129.at n=12A175658
• Expansion of 1/( (1 + x)^2 * (1 - x^2*(1 + x)^3) ).at n=21A375365