A247743 - OEIS

%I #6 Feb 06 2017 18:59:32

%S 0,0,0,0,48,528,4752,44080,408192,3738692,32818416,282587664,

%T 2417602560,20523442012,172798010156,1443679767220,11992713950224,

%U 99165736820120,816514750434924,6697254233908596,54745726513283448,446174778295639204,3626566397497170096

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

%H Alois P. Heinz, <a href="/A247743/b247743.txt">Table of n, a(n) for n = 0..500</a>

%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Pentomino">Pentomino</a>

%F a(n) = Sum_{k>0} k * A247710(n,k).

%Y Cf. A174249, A233427, A247710.

%K nonn

%O 0,5

%A _Alois P. Heinz_, Sep 23 2014