Number of n X 4 0..1 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
A280550
Number of n X 4 0..1 arrays with no element equal to more than one of its horizontal and vertical neighbors, with the exception of exactly two elements, and with new values introduced in order 0 sequentially upwards.
Terms
- a(0) =1a(1) =34a(2) =144a(3) =382a(4) =832a(5) =1666a(6) =3182a(7) =5886a(8) =10680a(9) =19122a(10) =33920a(11) =59754a(12) =104690a(13) =182598a(14) =317264a(15) =549398a(16) =948528a(17) =1633186a(18) =2805094a(19) =4807006a(20) =8220440a(21) =14030634a(22) =23904656a(23) =40659818a(24) =69051850a(25) =117099910a(26) =198312144a(27) =335420782a(28) =566645728a(29) =956190466
External references
- oeis: A280550