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A174249
Number of tilings of a 5 X n rectangle with n pentominoes of any shape.
82
1, 1, 5, 56, 501, 4006, 27950, 214689, 1696781, 13205354, 101698212, 782267786, 6048166230, 46799177380, 361683136647, 2793722300087, 21583392631817, 166790059833039, 1288885349447958, 9959188643348952, 76953117224941654, 594617039453764617, 4594660583890506956
OFFSET
0,3
FORMULA
a(n) ~ c * d^n, where d =
7.727036840800092392128639105511391434436212757335030092041375597587338371937..., c =
0.13364973920881772493778581621701653927538155984099992758656160782495174... (1/d is the root of the denominator, see g.f.). - Vaclav Kotesovec, May 19 2015
KEYWORD
nonn,easy
AUTHOR
Bob Harris (me13013(AT)gmail.com), Mar 13 2010
EXTENSIONS
a(0) prepended, a(11)-a(22) from Alois P. Heinz, Dec 05 2013
STATUS
approved