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%I #13 Dec 15 2014 23:43:23
%S 1,7,49,216,805,2733,9105,28123,85340,255800,768155,2265062,6588759,
%T 18667410,51448497,137051636,353575584,878804335,2113497469,
%U 4908984819,11049271004,24062242901,50742319631
%N Starting from the standard 12 against 12 starting position in checkers, the sequence gives the number of distinct positions that can arise after n moves.
%C These numbers are generally smaller than those in A133046 because one line of play can transpose into another.
%Y Cf. A133046, A055213.
%K nonn,nice
%O 0,2
%A Jonathan Schaeffer (jonathan(AT)cs.ualberta.ca), Dec 27 2007
%E a(16)-a(22) computed by _Paul Byrne_, Sep 2012
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