231611

Properties

Appears in sequences

• Numerator sequence of mean length of certain stackings of n+1 squares on a double staircase.at n=18A055245
• Triangle T(n, k) = T(n-1, k) + T(n-1, k-1) + (n^2 +n -1)*T(n-2, k-1), read by rows.at n=39A154233
• Triangle T(n, k) = T(n-1, k) + T(n-1, k-1) + (n^2 +n -1)*T(n-2, k-1), read by rows.at n=41A154233
• Prime numbersat n=20572