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A334767 a(n) = Product_{k=1..n} d(2*k), where d() is the number of divisors function A000005. 0
2, 6, 24, 96, 384, 2304, 9216, 46080, 276480, 1658880, 6635520, 53084160, 212336640, 1274019840, 10192158720, 61152952320, 244611809280, 2201506283520, 8806025134080, 70448201072640, 563585608581120, 3381513651486720, 13526054605946880 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..23.

EXAMPLE

a(4) = d(2)*d(4)*d(6)*d(8) = 2*3*4*4 = 96.

MATHEMATICA

Rest @ FoldList[Times, 1, DivisorSigma[0, Range[2, 40, 2]]] (* Amiram Eldar, May 10 2020 *)

PROG

(PARI) a(n) = prod(k=1, n, numdiv(2*k)); \\ Michel Marcus, May 10 2020

CROSSREFS

Cf. A000005, A066843, A099777.

Sequence in context: A179356 A179363 A084509 * A323260 A147915 A147906

Adjacent sequences:  A334764 A334765 A334766 * A334768 A334769 A334770

KEYWORD

nonn

AUTHOR

Ctibor O. Zizka, May 10 2020

STATUS

approved

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Last modified September 29 21:59 EDT 2020. Contains 337432 sequences. (Running on oeis4.)