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A247742
Total number of V shapes in all tilings of a 5 X n rectangle with pentominoes of any shape.
2
0, 0, 0, 20, 192, 1568, 12636, 114216, 1022604, 8640980, 72406668, 605996308, 5065065936, 42045917448, 346705312932, 2848191025876, 23325323646860, 190440300054560, 1550193295412264, 12585187313440032, 101937894879304356, 823951520087842720, 6646993031822674592
OFFSET
0,4
LINKS
Wikipedia, Pentomino
FORMULA
a(n) = Sum_{k>0} k * A247709(n,k).
CROSSREFS
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Sep 23 2014
STATUS
approved