T(n,k)=Number of nXk 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing.
A229445
T(n,k)=Number of nXk 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing.
Terms
- a(0) =3a(1) =4a(2) =5a(3) =5a(4) =7a(5) =8a(6) =6a(7) =10a(8) =13a(9) =12a(10) =7a(11) =14a(12) =22a(13) =25a(14) =17a(15) =8a(16) =19a(17) =37a(18) =53a(19) =47a(20) =23a(21) =9a(22) =25a(23) =60a(24) =109a(25) =128a(26) =84a(27) =30a(28) =10a(29) =32
External references
- oeis: A229445