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A185968 a(n) = n^2*2^(n^2-1). 2
0, 1, 32, 2304, 524288, 419430400, 1236950581248, 13792273858822144, 590295810358705651712, 97922991388784963151200256, 63382530011411470074835160268800 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

a(n) is the number of elements (ordered pairs) in all binary relations on {1,2,...,n}.

Equivalently a(n) is the number of 1's in all n X n {0,1} matrices.

LINKS

G. C. Greubel, Table of n, a(n) for n = 0..57

MATHEMATICA

Table[n^2 *2^(n^2-1), {n, 0, 10}]

PROG

(PARI) for(n=0, 25, print1(n^2 *2^(n^2-1), ", ")) \\ G. C. Greubel, Jul 23 2017

CROSSREFS

Cf. A175716

Sequence in context: A180954 A220730 A254458 * A247999 A222742 A077143

Adjacent sequences:  A185965 A185966 A185967 * A185969 A185970 A185971

KEYWORD

nonn

AUTHOR

Geoffrey Critzer, Feb 07 2011

STATUS

approved

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Last modified April 12 08:50 EDT 2021. Contains 342912 sequences. (Running on oeis4.)