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Search: id:A061703
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A061703 G.f.: 2*x*(2-2*x-3*x^2+2*x^3)/((1-3*x-x^2+x^3)*(1-x)). +0
3
0, 4, 12, 34, 108, 344, 1104, 3546, 11396, 36628, 117732, 378426, 1216380, 3909832, 12567448, 40395794, 129844996, 417363332, 1341539196, 4312135922, 13860583628, 44552347608, 143205490528, 460308235562, 1479577849604 (list; graph; listen)
OFFSET

0,2

REFERENCES

R. P. Stanley, Enumerative Combinatorics I, Example 4.7.17.

LINKS

Index entries for sequences related to linear recurrences with constant coefficients

CROSSREFS

Row sums of A061702, A000183.

Sequence in context: A014143 A077994 A077843 this_sequence A126948 A131593 A084362

Adjacent sequences: A061700 A061701 A061702 this_sequence A061704 A061705 A061706

KEYWORD

easy,nonn

AUTHOR

Vladeta Jovovic (vladeta(AT)eunet.rs), Jun 18 2001

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.


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