A374655 a(n) = (1/3)*A374654(n).

1, 2, 8, 40, 320, 3840, 72960, 2188800, 105062400, 8089804800, 1003135795200, 200627159040000, 64802572369920000, 33826942777098240000, 28549939703870914560000, 38970667695783798374400000, 86047234272290626810675200000, 307360720820622118967731814400000

Offset: 0

Author

Clark Kimberling, Jul 28 2024

Keywords

• nonn

Comments

a(n+1)/a(n) is an integer for n>=0, so (a(n)) is a divisibility sequence.

Crossrefs

Cf. A000142, A374654.

Programs

Mathematica

w[n_] := Product[LucasL[k] + 1, {k, 0, n}]
(1/3) Table[w[n], {n, 0, 20}]