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A247736 Total number of I shapes in all tilings of a 5 X n rectangle with pentominoes of any shape. 2
0, 1, 2, 11, 122, 2278, 17502, 140037, 1250890, 11184764, 96901618, 810143038, 6787465080, 56871594099, 473417649550, 3913478050583, 32192184170708, 264014564271675, 2158561440821352, 17592866753339355, 142983916007396542, 1159269824603687631, 9378694043134778568 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..500

Wikipedia, Pentomino

FORMULA

a(n) = Sum_{k>0} k * A247703(n,k).

CROSSREFS

Cf. A174249, A233427, A247703.

Sequence in context: A251663 A118794 A222879 * A155928 A001946 A121337

Adjacent sequences:  A247733 A247734 A247735 * A247737 A247738 A247739

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Sep 23 2014

STATUS

approved

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Last modified October 16 20:55 EDT 2019. Contains 328103 sequences. (Running on oeis4.)