A247735 Total number of F shapes in all tilings of a 5 X n rectangle with pentominoes of any shape.

0, 0, 0, 4, 68, 744, 7088, 69176, 658776, 5995348, 52831448, 458439732, 3944077760, 33606901296, 283630894720, 2375471834288, 19779055344468, 163866917256420, 1351464466008112, 11100931884955344, 90860898121739864, 741378713523090200, 6032337718479599100

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 * A247702(n,k).

Crossrefs

Cf. A174249, A233427, A247702.

Sequence in context: A133881 A272134 A073774 * A221336 A339787 A323276

Adjacent sequences: A247732 A247733 A247734 * A247736 A247737 A247738

Keyword

nonn

Author

Alois P. Heinz, Sep 23 2014

Status

approved