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A247744 Total number of X shapes in all tilings of a 5 X n rectangle with pentominoes of any shape. 2
0, 0, 0, 1, 8, 76, 752, 7728, 76138, 683740, 6016612, 52483260, 453461612, 3873299197, 32718505462, 274368261226, 2287565667766, 18973561019204, 156622182476404, 1287479429817295, 10545476231546336, 86101164740284870, 700977394316933694, 5692064258367318333 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,5
LINKS
Wikipedia, Pentomino
FORMULA
a(n) = Sum_{k>0} k * A247711(n,k).
CROSSREFS
Sequence in context: A247828 A303736 A083234 * A144851 A233827 A231286
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Sep 23 2014
STATUS
approved

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Last modified March 2 05:08 EST 2024. Contains 370460 sequences. (Running on oeis4.)