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%I #48 Oct 27 2023 21:44:48
%S 1,1,41,3127,41813,1269900,45832761,1064557805,30860212081,
%T 928789262080,25020222581494,714819627084057,20574308184277971,
%U 576115800837801057,16381774291037991059,466431115279461257920,13190758349044182698371,374524994697062170913555
%N Number of ways in which a 9 X n grid can be tiled with trominoes.
%H Alois P. Heinz, <a href="/A215826/b215826.txt">Table of n, a(n) for n = 0..700</a> (terms n = 1..42 from V. Raman)
%H Project Euler, <a href="http://projecteuler.net/problem=161">Problem 161: Triominoes</a>.
%Y Cf. A215827 (number of memoizations needed to calculate a(n)), A134438, A233290, A269664.
%Y Column k=9 of A233320.
%K nonn
%O 0,3
%A _V. Raman_, Aug 23 2012