Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 0 and 0 1 1 vertically.

A207909

Number of 4Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 0 and 0 1 1 vertically.

Terms

    a(0) =9a(1) =81a(2) =261a(3) =841a(4) =4089a(5) =19881a(6) =80511a(7) =326041a(8) =1428071a(9) =6255001a(10) =26473085a(11) =112042225a(12) =481310535a(13) =2067611841a(14) =8824602441a(15) =37663553041a(16) =161202941369a(17) =689961148321

External references