Number of (n+1)X(n+1) 0..1 arrays with every 2X2 subblock ne-sw antidiagonal difference unequal to its neighbors horizontally and nw+se diagonal sum unequal to its neighbors vertically.
A253691
Number of (n+1)X(n+1) 0..1 arrays with every 2X2 subblock ne-sw antidiagonal difference unequal to its neighbors horizontally and nw+se diagonal sum unequal to its neighbors vertically.
Terms
- a(0) =16a(1) =76a(2) =234a(3) =700a(4) =1632a(5) =3042a(6) =6558a(7) =14710a(8) =30864a(9) =74332a(10) =143078a(11) =301840a(12) =595924a(13) =1315998a(14) =2668860a(15) =6102208a(16) =11569664a(17) =25167926a(18) =48101064a(19) =108872328a(20) =212350500a(21) =492777890a(22) =912037666a(23) =2072968028a(24) =3852486610a(25) =9062325392a(26) =17036265558
External references
- oeis: A253691