Number of n X 4 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors.
A208633
Number of n X 4 0..1 arrays with new values 0..1 introduced in row major order and no element equal to more than one of its immediate leftward or upward or right-upward antidiagonal neighbors.
Terms
- a(0) =8a(1) =23a(2) =71a(3) =225a(4) =722a(5) =2331a(6) =7548a(7) =24476a(8) =79423a(9) =257807a(10) =836973a(11) =2717446a(12) =8823199a(13) =28648292a(14) =93019712a(15) =302032007a(16) =980690055a(17) =3184277945a(18) =10339281402a(19) =33571429395a(20) =109005736508a(21) =353939387572
External references
- oeis: A208633