Number of 4 X n 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.
A208639
Number of 4 X n 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) =34a(2) =95a(3) =225a(4) =494a(5) =1042a(6) =2149a(7) =4375a(8) =8840a(9) =17784a(10) =35687a(11) =71509a(12) =143170a(13) =286510a(14) =573209a(15) =1146627a(16) =2293484a(17) =4587220a(18) =9174715a(19) =18349729a(20) =36699782a(21) =73399914a(22) =146800205a(23) =293600815a(24) =587202064a(25) =1174404592a(26) =2348809679a(27) =4697619885
External references
- oeis: A208639