4521984

Appears in sequences

• Expansion of (1-3x+4x^2-3x^3+x^4)/(1-2x)^2.at n=20A084861
• a(n) = 2^(n - 2)*(binomial(n,2) + 2).at n=16A104270
• Consider the Watanabe tag system defined in A291067; a(n) = number of binary words of length n which terminate in a cycle.at n=22A291781
• Heinz numbers of integer partitions whose product equals their length.at n=34A353699
• Triangle read by rows: T(n, k) = n! * 3^k * hypergeom([-k], [-n], 2/3).at n=40A375600