Number of nX6 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing.
A229443
Number of nX6 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) =25a(2) =93a(3) =387a(4) =1609a(5) =6374a(6) =23610a(7) =81177a(8) =258698a(9) =765702a(10) =2113491a(11) =5467941a(12) =13331626a(13) =30795942a(14) =67738085a(15) =142526854a(16) =288060848a(17) =561310955a(18) =1057997269a(19) =1934623043a(20) =3440842683a(21) =5966088386a(22) =10105555904a(23) =16752093179a(24) =27222289586
External references
- oeis: A229443