Number of n X 7 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing.
A229444
Number of n X 7 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) =9a(1) =32a(2) =138a(3) =665a(4) =3184a(5) =14536a(6) =62205a(7) =247607a(8) =914271a(9) =3133068a(10) =9990129a(11) =29755249a(12) =83162347a(13) =219151523a(14) =547116607a(15) =1299869098a(16) =2951439969a(17) =6429248828a(18) =13483439736a(19) =27310437901a(20) =53577074678a(21) =102061137870a(22) =189220453845
External references
- oeis: A229444