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.

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