225230

Appears in sequences

• Number of alternating full cycles on n letters.at n=11A137590
• Triangle T(n, k, m) = (m*(n-k) + 1)*T(n-1, k-1, m) + (m*k + 1)*T(n-1, k, m) + m*k*(n-k)*T(n-2, k-1, m) with T(n, 0, m) = T(n, n, m) = 1 and m = 3, read by rows.at n=24A157149
• The number of even prime gaps g, satisfying g == 0 (mod 6), out of the first 2^n even prime gaps.at n=19A340948