1052729

Appears in sequences

• a(0) = 1; for n>0, a(n) = (2^n-1)*a(n-1)-(-1)^n.at n=6A111491
• a(n) = Sum_{k = 0..n} (-1)^(n+k)*binomial(n, k)*binomial(n+k, k)*A108625(n-1, n-k).at n=8A376458