273792

Appears in sequences

• G.f.: Sum_{n>=0} x^n/Product_{k=1..n} (1 - A002203(k)*x^k + (-1)^k*x^(2*k)), where A002203 is the companion Pell numbers.at n=13A206141
• a(n) = 288*n^2 - 96*n (n>=1).at n=30A305073
• T(n, m) = Sum_{k=1..(m+3)/2} C(m-k+2, k-1)*C(n+1, k-1)*C(n-m+k-1, k-1)*C(2*n-2*k+4, 2*m-4*k+5)/(C(2*k-2, k-1)*C(2*m-2*k+4, 2*k-2))/2, triangle read by rows.at n=62A338372
• Expansion of (1/x) * Series_Reversion( x / (1+x)^2 * (1-x^3) ).at n=10A369398