Number of 6 X n 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing.

A229449

Number of 6 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) =23a(1) =84a(2) =293a(3) =915a(4) =2546a(5) =6374a(6) =14536a(7) =30571a(8) =59969a(9) =110816a(10) =194535a(11) =326723a(12) =528084a(13) =825458a(14) =1252946a(15) =1853131a(16) =2678395a(17) =3792332a(18) =5271257a(19) =7205811a(20) =9702662a(21) =12886302a(22) =16900940a(23) =21912491a(24) =28110661a(25) =35711128a(26) =44957819a(27) =56125283a(28) =69521160a(29) =85488746

External references