A069344 - OEIS

%I #8 Apr 07 2021 18:51:03

%S 1,3,19,246,6486,346550,37410572,8142026722,3567024626500,

%T 3142034178023610

%N Number of n X n symmetric binary arrays with path of adjacent 1's from upper right corner to lower left corner.

%Y Cf. n X m A069325-A069342, n X n non-symmetric A069343.

%K nonn

%O 1,2

%A _R. H. Hardin_, Mar 16 2002