A247745 Total number of Y shapes in all tilings of a 5 X n rectangle with pentominoes of any shape.

0, 0, 0, 12, 224, 2096, 17732, 160624, 1498176, 13404068, 115123856, 980282312, 8327179132, 70264899456, 587727020332, 4882463109244, 40378339971868, 332612594766452, 2729309532474820, 22316919930250328, 181922495487675520, 1479018078159317720

Offset: 0

Author

Alois P. Heinz, Sep 23 2014

Keywords

• nonn

Links

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

Crossrefs

Cf. A174249, A233427, A247712.

Formula

a(n) = Sum_{k>0} k * A247712(n,k).