866320

Appears in sequences

• a(n) = binomial(n+5,5) * binomial(n+5,4)/(n+5).at n=12A006857
• Number of noninvertible 2 X 2 matrices over Z/nZ (determinant is a divisor of 0).at n=32A020479
• a(n) = 5*(n+1)*binomial(n+4,6).at n=11A027802
• Triangle T(n, k) = binomial(2*n, 2*k)*binomial(2*n+1, 2*k+1)/(2*n-2*k+1), read by rows.at n=38A155516
• Triangle T(n, k) = binomial(2*n, 2*k)*binomial(2*n+1, 2*k+1)/(2*n-2*k+1), read by rows.at n=42A155516
• a(n) = binomial(m+n-1,n)^2 - binomial(m+n,n+1)*binomial(m+n-2,n-1) with m = 14.at n=4A169937
• Number of (w,x,y,z) with all terms in {1,...,n} and w<=2x and y<=3z.at n=34A212513
• Triangle read by rows: T(n,k) = generalized binomial coefficients (n,k)_12 (n >= 0, 0 <= k <= n).at n=23A342891
• Triangle read by rows: T(n,k) = generalized binomial coefficients (n,k)_12 (n >= 0, 0 <= k <= n).at n=25A342891