Number of nX3 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically.
A207421
Number of nX3 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 0 1 0 vertically.
Terms
- a(0) =6a(1) =36a(2) =114a(3) =351a(4) =1162a(5) =3633a(6) =11067a(7) =33994a(8) =103972a(9) =315900a(10) =959469a(11) =2913192a(12) =8833205a(13) =26769585a(14) =81116398a(15) =245729000a(16) =744251550a(17) =2253989395a(18) =6825832650a(19) =20669704173a(20) =62589261963a(21) =189520870122a(22) =573861525576
External references
- oeis: A207421