Number of n X 6 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, rows lexicographically nondecreasing, and columns lexicographically nonincreasing.
A229426
Number of n X 6 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) =23a(1) =175a(2) =1116a(3) =5700a(4) =24126a(5) =87648a(6) =281016a(7) =812352a(8) =2152643a(9) =5297329a(10) =12231874a(11) =26724490a(12) =55625600a(13) =110928984a(14) =212948248a(15) =395089316a(16) =710860767a(17) =1243965435a(18) =2122565928a(19) =3539121568a(20) =5777563514a(21) =9250018192a(22) =14545817232a(23) =22496156480
External references
- oeis: A229426