A247741 - OEIS

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A247741

Total number of U shapes in all tilings of a 5 X n rectangle with pentominoes of any shape.

2

0, 0, 0, 18, 144, 1196, 10122, 92280, 821038, 6991890, 58992846, 496243152, 4159529298, 34612046520, 286233965312, 2357133355050, 19343135795244, 158206906810656, 1289891352293998, 10487551431195780, 85061169561727062, 688372469609962898, 5559403964257012514

(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 * A247708(n,k).

CROSSREFS

Cf. A174249, A233427, A247708.

Sequence in context: A126900 A178759 A036397 * A224329 A221352 A271755

Adjacent sequences: A247738 A247739 A247740 * A247742 A247743 A247744

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Sep 23 2014

STATUS

approved