Number of nX5 0..1 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor.
A201350
Number of nX5 0..1 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor.
Terms
- a(0) =4a(1) =23a(2) =118a(3) =752a(4) =4860a(5) =29540a(6) =164704a(7) =838248a(8) =3906802a(9) =16781171a(10) =66921332a(11) =249553233a(12) =875898271a(13) =2910325591a(14) =9200601794a(15) =27796173121a(16) =80558496898a(17) =224724538799a(18) =605174810816
External references
- oeis: A201350