|
%I M3769 #32 Nov 19 2016 19:25:34
%S 1,1,1,5,7,37,104,766,3970,43318,431932,7695805,137066448,4015896016,
%T 128095791922,6371333036059,355704307903818,30153126159555641,
%U 2952926822418475378,431453249608567040694,73569487283165427567144,18558756256964594960321428
%N Number of ways to quarter an n X n chessboard.
%C See A257952 for much more information.
%C See A272070 for information on odd terms.
%D M. Gardner, The Unexpected Hanging and Other Mathematical Diversions. Simon and Schuster, NY, 1969, p. 189.
%D Popular Computing, Vol. 1 (No. 7, 1973), front cover and page 2.
%D T. R. Parkin, personal communication.
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H Andrew Howroyd, <a href="/A006067/b006067.txt">Table of n, a(n) for n = 1..28</a>
%H <a href="/A003213/a003213.jpg">Illustration showing that a(6) = 37.</a>
%F a(2n) = A257952(n), a(2n+1) = A272070(n). - _Andrew Howroyd_, Apr 19 2016
%Y Cf. A257952, A064941, A272070.
%K nonn,nice
%O 1,4
%A _N. J. A. Sloane_
%E a(8) corrected, a(9)-a(22) from _Andrew Howroyd_, Apr 18 2016
|
