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Search: id:A082679
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A082679 Number of Lego towers, one piece per floor, where every floor is perpendicular to the one below it (so we have a kind of 3-dimensional zigzag pattern). +0
2
0, 1, 2, 6, 20, 69, 241, 845, 2966, 10414, 36568, 128409, 450913, 1583401, 5560186, 19524854, 68562444, 240760253, 845440977, 2968805845, 10425101678, 36608235998, 128551546480, 451414815601, 1585164405441 (list; graph; listen)
OFFSET

0,3

LINKS

D. Zeilberger, [math/9801016] Automated counting of LEGO towers

FORMULA

G.f.: x*(1-3*x+2*x^2-x^3)/(1-5*x+6*x^2-3*x^3+x^4).

CROSSREFS

Sequence in context: A150121 A150122 A150123 this_sequence A094854 A026029 A078483

Adjacent sequences: A082676 A082677 A082678 this_sequence A082680 A082681 A082682

KEYWORD

nonn,easy

AUTHOR

Ralf Stephan (ralf(AT)ark.in-berlin.de), May 19 2003

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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