Number of nX4 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A302305
Number of nX4 0..1 arrays with every element equal to 0, 1, 3 or 4 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =5a(1) =21a(2) =26a(3) =66a(4) =153a(5) =380a(6) =1090a(7) =3120a(8) =9130a(9) =28503a(10) =92139a(11) =306958a(12) =1051554a(13) =3668169a(14) =12963076a(15) =46237599a(16) =165941571a(17) =598016312a(18) =2161073292a(19) =7823738491a(20) =28358286582a(21) =102869586674a(22) =373350974508
External references
- oeis: A302305