Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.
A208104
Number of n X 4 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 1 1 and 1 1 0 vertically.
Terms
- a(0) =9a(1) =81a(2) =169a(3) =361a(4) =841a(5) =2025a(6) =5041a(7) =12769a(8) =32761a(9) =84681a(10) =219961a(11) =573049a(12) =1495729a(13) =3908529a(14) =10220809a(15) =26739241a(16) =69973225a(17) =183142089a(18) =479391025a(19) =1254930625a(20) =3285238489a(21) =8600522121a(22) =22515902809a(23) =58946498521a(24) =154322479921a(25) =404019140625
External references
- oeis: A208104