A028368 a(n) = (Product_{j=1..n-1} (2^j-1)) * 2^binomial(n+1,2).

1, 2, 8, 192, 21504, 10321920, 20478689280, 165140150353920, 5369036568306647040, 700981414358115837542400, 366798338802685125615786393600, 768480666818860817418136536376934400

Offset

0,2

Links

Table of n, a(n) for n=0..11.

I. Strazdins, Universal affine classification of Boolean functions, Acta Applic. Math. 46 (1997), 147-167.

Formula

a(n) ~ c * 2^(n^2), where c = A048651 = 0.288788095... - Vaclav Kotesovec, Oct 27 2017

Mathematica

Table[Product[2^j - 1, {j, 1, n-1}] * 2^(n*(n+1)/2), {n, 0, 12}] (* Vaclav Kotesovec, Oct 27 2017 *)

Crossrefs

Cf. A005329.

Sequence in context: A156526 A009505 A305737 * A056990 A234637 A234632

Adjacent sequences: A028365 A028366 A028367 * A028369 A028370 A028371

Keyword

nonn

Author

N. J. A. Sloane.

Status

approved