Number of lower triangles of a 3 X 3 integer array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by n or less and triangles differing by a constant counted only once.
A195221
Number of lower triangles of a 3 X 3 integer array with each element differing from all of its diagonal, vertical, antidiagonal and horizontal neighbors by n or less and triangles differing by a constant counted only once.
Terms
- a(0) =91a(1) =1047a(2) =5453a(3) =18903a(4) =51205a(5) =117585a(6) =239891a(7) =447797a(8) =780007a(9) =1285459a(10) =2024529a(11) =3070235a(12) =4509441a(13) =6444061a(14) =8992263a(15) =12289673a(16) =16490579a(17) =21769135a(18) =28320565a(19) =36362367a(20) =46135517a(21) =57905673a(22) =71964379a(23) =88630269a(24) =108250271a(25) =131200811
External references
- oeis: A195221