Number of n X 3 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing.
A229440
Number of n X 3 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) =5a(1) =10a(2) =22a(3) =53a(4) =128a(5) =293a(6) =625a(7) =1244a(8) =2327a(9) =4124a(10) =6976a(11) =11335a(12) =17786a(13) =27071a(14) =40115a(15) =58054a(16) =82265a(17) =114398a(18) =156410a(19) =210601a(20) =279652a(21) =366665a(22) =475205a(23) =609344a(24) =773707a(25) =973520a(26) =1214660a(27) =1503707a(28) =1847998a(29) =2255683
External references
- oeis: A229440