Number of nX3 0..1 arrays with every element unequal to 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A317818
Number of nX3 0..1 arrays with every element unequal to 1, 2 or 3 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =1a(1) =16a(2) =35a(3) =135a(4) =356a(5) =1113a(6) =3150a(7) =9484a(8) =27522a(9) =81798a(10) =239572a(11) =707803a(12) =2080838a(13) =6134691a(14) =18056895a(15) =53200116a(16) =156648460a(17) =461423021a(18) =1358857346a(19) =4002288009a(20) =11787108436a(21) =34715792064a(22) =102243257032a(23) =301126862896a(24) =886870040361
External references
- oeis: A317818