Search: id:A007545
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%I A007545 M5100
%S A007545 1,20,400,8902,197742,4897256,120921506,3284294545,88867026005
%N A007545 Number of chess games with n plies (another version).
%C A007545 Up to a(6) this is the number of chess games with all legality constraints 
               removed, even allowing the king to be captured. (This differs from 
               the number of positions in suicide chess, as suicide chess contains 
               compulsory captures.) - Richard Bean (rwb(AT)eskimo.com), Jun 18 
               2003
%D A007545 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%H A007545 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               Chess.html">Link to a section of The World of Mathematics.</a>
%H A007545 <a href="Sindx_Ch.html#chess">Index entries for sequences related to 
               number of chess games</a>
%Y A007545 Cf. A048987.
%Y A007545 Sequence in context: A007577 A048987 A006494 this_sequence A055476 A041181 
               A041762
%Y A007545 Adjacent sequences: A007542 A007543 A007544 this_sequence A007546 A007547 
               A007548
%K A007545 fini,nonn,hard
%O A007545 0,2
%A A007545 Ken Thompson (ken(AT)plan9.bell-labs.com)
%E A007545 I am not sure of the precise rules that were used to compute these numbers. 
               A006494 and A048987 are the preferred versions of this sequence. 
               - N. J. A. Sloane (njas(AT)research.att.com).

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