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A026809 a(n) = 3^n*(3^n-1)*(3^n-2)/6. 0
0, 1, 84, 2925, 85320, 2362041, 64304604, 1741001445, 47050068240, 1270739210481, 34313445309924, 926494403955165, 25015631334908760, 675424587904113321, 18236486750190760044, 492385348146244352085, 13294406252968671566880 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..16.

FORMULA

a(n) = binomial(3^n, 3), n >= 0. - Zerinvary Lajos, Jan 07 2008

MAPLE

seq(binomial(3^n, 3), n=0..16); # Zerinvary Lajos, Jan 07 2008

CROSSREFS

Subsequence of A000292.

Sequence in context: A140903 A219470 A219372 * A114253 A017800 A035737

Adjacent sequences:  A026806 A026807 A026808 * A026810 A026811 A026812

KEYWORD

nonn

AUTHOR

N. J. A. Sloane

STATUS

approved

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Last modified January 22 18:38 EST 2019. Contains 319365 sequences. (Running on oeis4.)