64899744

Appears in sequences

• a(n) = 4*(2n+1)!/n!^2.at n=11A002011
• a(n) = (n+1)*binomial(n+1,12).at n=12A027772
• Sum of squared terms in rows of triangle A152547: a(n) = Sum_{k=0..C(n,[n/2])-1} A152547(n,k)^2.at n=23A152548
• a(0) = 1; for n >= 1, a(n) = A059897(n, a(n-1)).at n=23A284567
• a(n) = n*binomial(n, n/2) if n is even otherwise 2^(n-1)*binomial(n-1, (n-1)/2).at n=24A389423