53504

Appears in sequences

• a(n) = Sum_{k=0..n} (-2)^k * binomial(2n-k,k) * (n-k)!.at n=9A097625
• Molien series for complete weight enumerators of doubly-even Euclidean self-dual codes over the Galois ring GR(4,2).at n=5A099750
• Sylvester dividends for A002605.at n=19A105608
• Numbers of the form p^8*q*r where p, q, and r are distinct primes.at n=35A179747
• G.f. A(x,y) satisfies: A(x,y) = x*y + A(x,x*y)^2, with A(0,y) = 1.at n=76A275670
• a(n) is the denominator of Product_{i=0..n-1} (n-i)^((-1)^ceiling(i/2)).at n=20A337355