Number of 7 X n 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, and rows and columns lexicographically nondecreasing.
A229450
Number of 7 X n 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) =30a(1) =142a(2) =625a(3) =2402a(4) =8024a(5) =23610a(6) =62205a(7) =149031a(8) =329106a(9) =677706a(10) =1314145a(11) =2419348a(12) =4257692a(13) =7203590a(14) =11773293a(15) =18662385a(16) =28789446a(17) =43346358a(18) =63855729a(19) =92235910a(20) =130874080a(21) =182707874a(22) =251316029a(23) =341018523a(24) =456986682a(25) =605363730a(26) =793396257
External references
- oeis: A229450