A272122 - OEIS

A272122

a(n) is the number of positive divisors of A003266(n).

1, 1, 2, 4, 8, 20, 40, 120, 288, 864, 1728, 4800, 9600, 28800, 84480, 304128, 608256, 2322432, 9289728, 40642560, 116121600, 348364800, 696729600, 3185049600, 8918138880, 26754416640, 149824733184, 624269721600, 1248539443200, 6522981580800, 26091926323200, 107629196083200

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OFFSET

1,3

LINKS

Amiram Eldar, Table of n, a(n) for n = 1..794

FORMULA

a(n) = A000005(A003266(n)).

a(n+1) = 2*a(n) when n is in A069744.

MATHEMATICA

a[n_] := DivisorSigma[0, Fibonorial[n]]; Array[a, 32] (* Amiram Eldar, Aug 09 2022 *)

PROG

(PARI) a(n) = numdiv(prod(k=1, n, fibonacci(k)));