223146domain: NAppears in sequencesa(n) = (n+1)*binomial(n+4, 4).at n=20A027800a(n) = n*(n-1)*(n-2)^2.at n=21A047927Number of sequences of 5 throws of an n-sided die (with faces numbered 1, 2, ..., n) in which the sum of the throws first reaches or exceeds n on the 5th throw.at n=20A264750