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A247745 Total number of Y shapes in all tilings of a 5 X n rectangle with pentominoes of any shape. 2
0, 0, 0, 12, 224, 2096, 17732, 160624, 1498176, 13404068, 115123856, 980282312, 8327179132, 70264899456, 587727020332, 4882463109244, 40378339971868, 332612594766452, 2729309532474820, 22316919930250328, 181922495487675520, 1479018078159317720 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

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

Wikipedia, Pentomino

FORMULA

a(n) = Sum_{k>0} k * A247712(n,k).

CROSSREFS

Cf. A174249, A233427, A247712.

Sequence in context: A297503 A214512 A220068 * A098647 A300561 A290754

Adjacent sequences:  A247742 A247743 A247744 * A247746 A247747 A247748

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Sep 23 2014

STATUS

approved

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Last modified May 28 17:37 EDT 2020. Contains 334684 sequences. (Running on oeis4.)