Number of 4 X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 0 1 1 vertically.
A208421
Number of 4 X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 0 and 0 1 1 vertically.
Terms
- a(0) =9a(1) =81a(2) =261a(3) =1269a(4) =5139a(5) =22509a(6) =95265a(7) =409239a(8) =1746639a(9) =7475751a(10) =31957515a(11) =136685781a(12) =584484003a(13) =2499573411a(14) =10689072525a(15) =45711185121a(16) =195479542125a(17) =835952734845
External references
- oeis: A208421