Original entry on oeis.org
4, 8, 12, 15, 18, 21, 24, 26, 29, 31, 33, 35, 38, 39, 41
Offset: 1
a(2) = 8 = floor log A055213(2), where A055213(2) = 6972.
- Jonathan Schaeffer, N. Burch, Yngvi Bjornsson, Akihiro Kishimoto, Martin Muller, Rob Lake, Paul Lu and Steve Sutphen. "Checkers Is Solved", Science, Vol. 317, September 14, 2007, pp. 1518-1522.
A133046
Starting from the standard 12 against 12 starting position in checkers, the sequence gives the number of distinct move sequences after n moves.
Original entry on oeis.org
1, 7, 49, 302, 1469, 7361, 36768, 179740, 845931, 3963680, 18391564, 85242128, 388623673, 1766623630, 7978439499, 36263167175, 165629569428, 758818810990, 3493881706141, 16114043592799, 74545030871553, 345100524480819, 1602372721738102, 7437536860666213, 34651381875296000, 161067479882075800, 752172458688067137, 3499844183628002605, 16377718018836900735, 76309690522352444005
Offset: 0
Jonathan Schaeffer (jonathan(AT)cs.ualberta.ca), Dec 27 2007
- C. A. Pickover, The Math Book, Sterling, NY, 2009; see p. 512.
a(21)-a(26) computed by
Aart Bik, with last two completed Sep 18 2012. Rein Halbersma was first to compute a(22). Murray Cash confirmed Aart's a(23) and a(24) results.
a(27)-a(28) first computed by
Aart Bik, Sep 2012. Paul Byrne confirmed Aart's a(23)-a(28).
A133047
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.
Original entry on oeis.org
1, 7, 49, 216, 805, 2733, 9105, 28123, 85340, 255800, 768155, 2265062, 6588759, 18667410, 51448497, 137051636, 353575584, 878804335, 2113497469, 4908984819, 11049271004, 24062242901, 50742319631
Offset: 0
Jonathan Schaeffer (jonathan(AT)cs.ualberta.ca), Dec 27 2007
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