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A020726 Expansion of 1/((1-6x)(1-10x)(1-11x)). 0
1, 27, 493, 7599, 106645, 1411431, 17955757, 222093423, 2690508229, 32080473975, 377794514461, 4405195463487, 50953884924853, 585473143132359, 6690087028209805, 76090252032830991, 861988540696279717 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

a(n) = 21*a(n-1) - 110*a(n-2) + 6^n, a(0)=1, a(1)=27. - Vincenzo Librandi, Mar 11 2011

CROSSREFS

Sequence in context: A023946 A020971 A023772 * A020969 A025956 A020724

Adjacent sequences:  A020723 A020724 A020725 * A020727 A020728 A020729

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 17 12:38 EST 2012. Contains 206021 sequences.