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%I M3621
%S 0,0,1,4,28,85,630,3096,23220,123952,1036080,7230828,66349440,
%T 500721252,5080269600,45925520096,508031496000,4919774752448,
%U 59256847036800,656763354386032,8532986691801600,100525956801641104,1405335512577427200,18431883446961030912
%N Bishops on an n X n board (see Robinson paper for details).
%D R. W. Robinson, Counting arrangements of bishops, pp. 198-214 of Combinatorial Mathematics IV (Adelaide 1975), Lect. Notes Math., 560 (1976). [The sequence epsilon(n).]
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H R. W. Robinson, <a href="/A000899/a000899_1.pdf">Counting arrangements of bishops</a>, pp. 198-214 of Combinatorial Mathematics IV (Adelaide 1975), Lect. Notes Math., 560 (1976). (Annotated scanned copy)
%p For Maple program see A005635.
%K nonn
%O 2,4
%A _N. J. A. Sloane_.
%E More terms from _N. J. A. Sloane_, Sep 28 2006
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