2024785

Appears in sequences

• Binomial coefficients C(n,81).at n=4A017745
• Binomial coefficients C(85,n).at n=4A017801
• Triangle, read by rows, T(n,k) = binomial(n*(n-k)*k, k) + binomial(n*(n-k)*k, n -k).at n=31A157113
• Triangle, read by rows, T(n,k) = binomial(n*(n-k)*k, k) + binomial(n*(n-k)*k, n -k).at n=32A157113
• Doubly pentagonal numbers: a(n) = n*(3*n-2)*(3*n-1)*(3*n+1)/8.at n=28A232713