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A247735
Total number of F shapes in all tilings of a 5 X n rectangle with pentominoes of any shape.
2
0, 0, 0, 4, 68, 744, 7088, 69176, 658776, 5995348, 52831448, 458439732, 3944077760, 33606901296, 283630894720, 2375471834288, 19779055344468, 163866917256420, 1351464466008112, 11100931884955344, 90860898121739864, 741378713523090200, 6032337718479599100
OFFSET
0,4
LINKS
Wikipedia, Pentomino
FORMULA
a(n) = Sum_{k>0} k * A247702(n,k).
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Sep 23 2014
STATUS
approved