Number of nX5 0..1 arrays with every element unequal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A317860
Number of nX5 0..1 arrays with every element unequal to 1, 2 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =3a(1) =21a(2) =32a(3) =155a(4) =350a(5) =1001a(6) =2616a(7) =7926a(8) =21882a(9) =65134a(10) =190018a(11) =559868a(12) =1657078a(13) =4911800a(14) =14594042a(15) =43385463a(16) =129133814a(17) =384672503a(18) =1145753084a(19) =3415594783a(20) =10180797904a(21) =30355084163a(22) =90514426385a(23) =269916109949a(24) =804962375711
External references
- oeis: A317860