Number of n X 2 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, rows lexicographically nondecreasing, and columns lexicographically nonincreasing.
A229422
Number of n X 2 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) =5a(1) =12a(2) =27a(3) =55a(4) =102a(5) =175a(6) =282a(7) =432a(8) =635a(9) =902a(10) =1245a(11) =1677a(12) =2212a(13) =2865a(14) =3652a(15) =4590a(16) =5697a(17) =6992a(18) =8495a(19) =10227a(20) =12210a(21) =14467a(22) =17022a(23) =19900a(24) =23127a(25) =26730a(26) =30737a(27) =35177a(28) =40080a(29) =45477
External references
- oeis: A229422