T(n,k) = number of defective 4-colorings of an n X k 0..3 array connected horizontally, antidiagonally and vertically with exactly two mistakes, and colors introduced in row-major 0..3 order.
A229672
T(n,k) = number of defective 4-colorings of an n X k 0..3 array connected horizontally, antidiagonally and vertically with exactly two mistakes, and colors introduced in row-major 0..3 order.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =4a(5) =1a(6) =3a(7) =61a(8) =61a(9) =3a(10) =12a(11) =652a(12) =1555a(13) =652a(14) =12a(15) =50a(16) =5048a(17) =19805a(18) =19805a(19) =5048a(20) =50a(21) =210a(22) =33152a(23) =194575a(24) =328160a(25) =194575a(26) =33152a(27) =210a(28) =861a(29) =197248
External references
- oeis: A229672