Number of (n+1)X(4+1) 0..2 arrays with every 2X2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.
A253745
Number of (n+1)X(4+1) 0..2 arrays with every 2X2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.
Terms
- a(0) =7803a(1) =29737a(2) =247252a(3) =1143174a(4) =5195288a(5) =17656505a(6) =54890203a(7) =150904540a(8) =390365827a(9) =928677156a(10) =2090553259a(11) =4473135405a(12) =9220179921a(13) =18291567088a(14) =35191833486a(15) =65909750009a(16) =120749865702a(17) =216723296865a(18) =382241803433a(19) =663962769116
External references
- oeis: A253745