A134262 Number of n X n binary matrices with every 1 adjacent to another 1 horizontally or vertically.
1, 10, 250, 22946, 8222576, 11168045764, 57451983566596, 1121231537486377866, 82999668877677132763564, 23304040481827726137141908956, 24817820869161647380317564563160782
Offset: 1