Number of 4 X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 1 1 vertically.
A207684
Number of 4 X n 0..1 arrays avoiding 0 0 0 and 1 0 1 horizontally and 0 0 1 and 1 1 1 vertically.
Terms
- a(0) =9a(1) =81a(2) =166a(3) =436a(4) =964a(5) =2132a(6) =4846a(7) =11301a(8) =25496a(9) =57407a(10) =131250a(11) =299913a(12) =680860a(13) =1542076a(14) =3516426a(15) =8019977a(16) =18194846a(17) =41334779a(18) =94226716a(19) =214384000a(20) =486836482a(21) =1107706812a(22) =2522185912a(23) =5733889814a(24) =13035303238a(25) =29665346161a(26) =67490142684
External references
- oeis: A207684