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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
Wikipedia, Pentomino
FORMULA
a(n) = Sum_{k>0} k * A247708(n,k).
CROSSREFS
Sequence in context: A126900 A178759 A036397 * A224329 A221352 A271755
KEYWORD
nonn
AUTHOR
_Alois P. Heinz_, Sep 23 2014
STATUS
approved

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Last modified March 5 03:04 EST 2024. Contains 370537 sequences. (Running on oeis4.)