Number of nXn 0..1 arrays with every element unequal to 0, 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A317758
Number of nXn 0..1 arrays with every element unequal to 0, 1 or 2 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =6a(2) =16a(3) =43a(4) =109a(5) =266a(6) =639a(7) =1529a(8) =3674a(9) =8909a(10) =21853a(11) =54252a(12) =136213a(13) =345373a(14) =882828a(15) =2271143a(16) =5871373a(17) =15234214a(18) =39633091a(19) =103306417a(20) =269641062a(21) =704462713a(22) =1841692605a(23) =4816973880a(24) =12602801545
External references
- oeis: A317758