Number of 3 X n 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing.

A229446

Number of 3 X n 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) =8a(1) =13a(2) =22a(3) =37a(4) =60a(5) =93a(6) =138a(7) =197a(8) =272a(9) =365a(10) =478a(11) =613a(12) =772a(13) =957a(14) =1170a(15) =1413a(16) =1688a(17) =1997a(18) =2342a(19) =2725a(20) =3148a(21) =3613a(22) =4122a(23) =4677a(24) =5280a(25) =5933a(26) =6638a(27) =7397a(28) =8212a(29) =9085

External references