This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A187618 #14 Mar 14 2015 23:00:43 %S A187618 1,1,2,1,5,36,1,13,281,6728,1,34,2245,167089,12988816,1,89,18061, %T A187618 4213133,1031151241,258584046368,1,233,145601,106912793,82741005829, %U A187618 65743732590821,53060477521960000,1,610,1174500,2720246633,6675498237130,16848161392724969,43242613716069407953,112202208776036178000000 %N A187618 Triangle T(m,n) read by rows: number of domino tilings of the 2m X 2n grid (0 <= m <= n). %C A187618 A099390 is the main entry for this problem. %H A187618 Alois P. Heinz, <a href="/A187618/b187618.txt">Rows n = 0..14, flattened</a> %H A187618 <a href="/index/Do#domino">Index entries for sequences related to dominoes</a> %e A187618 Triangle begins: %e A187618 1 %e A187618 1 2 %e A187618 1 5 36 %e A187618 1 13 281 6728 %e A187618 1 34 2245 167089 12988816 %e A187618 1 89 ... %Y A187618 Cf. A099390, A187596, A187616, A187617. %K A187618 nonn,tabl %O A187618 0,3 %A A187618 _N. J. A. Sloane_, Mar 12 2011 %E A187618 More terms from _Nathaniel Johnston_, Mar 22 2011