T(n,k) = Number of n X k 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, rows lexicographically nondecreasing, and columns lexicographically nonincreasing.

A229428

T(n,k) = Number of n X k 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, rows lexicographically nondecreasing, and columns lexicographically nonincreasing.

Terms

    a(0) =3a(1) =5a(2) =5a(3) =8a(4) =12a(5) =8a(6) =12a(7) =27a(8) =27a(9) =12a(10) =17a(11) =55a(12) =83a(13) =55a(14) =17a(15) =23a(16) =102a(17) =222a(18) =222a(19) =102a(20) =23a(21) =30a(22) =175a(23) =524a(24) =754a(25) =524a(26) =175a(27) =30a(28) =38a(29) =282

External references