A144545 - OEIS

A144545

a(n) = 2^(n*(n-1))*(2^n + 1)*Product_{i=1..n-1} (4^i - 1).

2, 3, 60, 25920, 197406720, 25015379558400, 51615733565620224000, 1718194449153210615595008000, 918817155086936330770931156779008000, 7877103854727828347931810809383874168094720000, 1081561598265935342583934931877242782978883444539392000000

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OFFSET

0,1

LINKS

T. D. Noe, Table of n, a(n) for n = 0..20

MAPLE

g:=m->2^(m*(m-1))*mul( 4^i-1, i=1..m-1)*(2^m+1);

PROG

(Python)

from math import prod

def A144545(n): return ((1<<n)+1)*prod((1<<i)-1 for i in range(2, 2*n-1, 2)) << n*(n-1) # Chai Wah Wu, Jun 20 2022

CROSSREFS

Cf. A003923, A001308, A003053.

Sequence in context: A145556 A124083 A112098 * A085326 A062308 A072875

Adjacent sequences: A144542 A144543 A144544 * A144546 A144547 A144548

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, Dec 30 2008

STATUS

approved