A374656 a(n) = Product_{k=0..n} L(k)+2, where L=A000032 (Lucas numbers).

4, 12, 60, 360, 3240, 42120, 842400, 26114400, 1279605600, 99809236800, 12476154600000, 2507707074600000, 812497092170400000, 424935979205119200000, 359070902428325724000000, 490490852717092938984000000, 1083494293652058302215656000000

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. A000032, A374654, A374657.

Programs

Mathematica

w[n_] := Product[LucasL[k] + 2, {k, 0, n}]
Table[w[n], {n, 0, 20}]