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A247737
Total number of L shapes in all tilings of a 5 X n rectangle with pentominoes of any shape.
2
0, 0, 4, 24, 436, 3888, 29880, 264460, 2353136, 20400352, 171215320, 1430108512, 11962161392, 99523393628, 822501750184, 6763177931936, 55433124540308, 453013557727460, 3690931980743340, 29988435689294280, 243064471330287696, 1965884816120576180
OFFSET
0,3
LINKS
Wikipedia, Pentomino
FORMULA
a(n) = Sum_{k>0} k * A247704(n,k).
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Sep 23 2014
STATUS
approved