%I #13 Jan 29 2024 08:03:45
%S 1,1,1,1,2,1,1,3,3,1,1,5,7,5,1,1,8,17,17,8,1,1,13,41,63,41,13,1,1,21,
%T 99,227,227,99,21,1,1,34,239,827,1234,827,239,34,1,1,55,577,2999,6743,
%U 6743,2999,577,55,1,1,89,1393,10897,36787,55447,36787,10897,1393,89,1
%N Array read by antidiagonals: T(n,m) = number of independent sets in the grid graph P_n X P_m.
%C This table is indexed starting at 0. The table in A089934 is 1 based.
%C A181031 is essentially the same array (see the Comments by _Steve Butler_ in A006506). - _N. J. A. Sloane_, Jan 27 2015
%e Square array T(n,m) begins:
%e 1, 1, 1, 1, 1, 1, ...
%e 1, 2, 3, 5, 8, 13, ...
%e 1, 3, 7, 17, 41, 99, ...
%e 1, 5, 17, 63, 227, 827, ...
%e 1, 8, 41, 227, 1234, 6743, ...
%e 1, 13, 99, 827, 6743, 55447, ...
%Y Main entry: A089934.
%Y Main diagonal gives A006506.
%Y Cf. A181031.
%K nonn,tabl
%O 0,5
%A _Mitch Harris_, Nov 17 2003