T(n,k)=Number of lower triangles of an n X n 0..k array with each element differing from all of its horizontal and vertical neighbors by one.
A194998
T(n,k)=Number of lower triangles of an n X n 0..k array with each element differing from all of its horizontal and vertical neighbors by one.
Terms
- a(0) =2a(1) =3a(2) =2a(3) =4a(4) =6a(5) =2a(6) =5a(7) =10a(8) =20a(9) =2a(10) =6a(11) =14a(12) =42a(13) =80a(14) =2a(15) =7a(16) =18a(17) =66a(18) =248a(19) =576a(20) =2a(21) =8a(22) =22a(23) =90a(24) =458a(25) =2290a(26) =4608a(27) =2a(28) =9a(29) =26
External references
- oeis: A194998