%I #12 Feb 06 2017 18:21:16
%S 1,1,1,1,1,34,95,190,325,506,3324,10353,25607,55346,108756,389216,
%T 1208901,3281686,8006108,17950204,51430928,150609259,419540401,
%U 1090827453,2651884943,7077981621,19691707908,54499735145,145671654672,371632691473,976543067070
%N Number of tilings of a 15 X n rectangle using 3n pentominoes of shape I.
%H Alois P. Heinz, <a href="/A247218/b247218.txt">Table of n, a(n) for n = 0..1000</a>
%H Wikipedia, <a href="https://en.wikipedia.org/wiki/Pentomino">Pentomino</a>
%Y Cf. A174249, A233427, A003520, A247117.
%Y Column k=5 of A251072.
%K nonn
%O 0,6
%A _Alois P. Heinz_, Nov 26 2014