Number of nX3 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A303520
Number of nX3 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =3a(1) =11a(2) =18a(3) =39a(4) =95a(5) =246a(6) =687a(7) =2023a(8) =6126a(9) =19571a(10) =63599a(11) =209618a(12) =700539a(13) =2356511a(14) =7961506a(15) =26985119a(16) =91629471a(17) =311488830a(18) =1059693975a(19) =3606749879a(20) =12279357318a(21) =41813315995a(22) =142397488591a(23) =484976347386
External references
- oeis: A303520