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A061534 Expansion of (1-x^2)/(1-3*x-x^2+x^3). 0
1, 3, 9, 29, 93, 299, 961, 3089, 9929, 31915, 102585, 329741, 1059893, 3406835, 10950657, 35198913, 113140561, 363669939, 1168951465, 3757383773, 12077432845 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

The number of tilings of a 2*n grid using dominoes and singletons with two horizontal dominoes or one vertical domino in the two rightmost squares. - John M. Campbell, Mar 05 2011

LINKS

INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 1056

CROSSREFS

Sequence in context: A098589 A024744 A024964 * A071728 A036550 A071732

Adjacent sequences:  A061531 A061532 A061533 * A061535 A061536 A061537

KEYWORD

nonn

AUTHOR

Henry Bottomley (se16(AT)btinternet.com), May 16 2001

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Last modified February 15 19:07 EST 2012. Contains 205852 sequences.