A247740 - OEIS

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A247740

Total number of T shapes in all tilings of a 5 X n rectangle with pentominoes of any shape.

2

0, 0, 0, 6, 66, 772, 6760, 60122, 552930, 4887052, 42365416, 361418592, 3063883318, 25819450218, 215875963118, 1793852851690, 14833014554258, 122147248758898, 1002084660185318, 8192705916505028, 66777880125812344, 542833111487459532, 4401913323626254612, 35616479684643020150

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,4

LINKS

Alois P. Heinz, Table of n, a(n) for n = 0..500

Wikipedia, Pentomino

FORMULA

a(n) = Sum_{k>0} k * A247707(n,k).

CROSSREFS

Cf. A174249, A233427, A247707.

Sequence in context: A186666 A129554 A165229 * A253621 A127857 A127858

Adjacent sequences: A247737 A247738 A247739 * A247741 A247742 A247743

KEYWORD

nonn

AUTHOR

Alois P. Heinz, Sep 23 2014

STATUS

approved