Number of (2+1)X(n+1) 0..2 arrays with every 2X2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.
A253750
Number of (2+1)X(n+1) 0..2 arrays with every 2X2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.
Terms
- a(0) =450a(1) =2723a(2) =10182a(3) =29737a(4) =70590a(5) =148134a(6) =298760a(7) =587522a(8) =1126853a(9) =2134789a(10) =4034824a(11) =7609993a(12) =14320586a(13) =26934197a(14) =50677637a(15) =95365268a(16) =179465371a(17) =337787639a(18) =635898370a(19) =1197229227a(20) =2254216671a(21) =4244626838a(22) =7992870420a(23) =15051425511
External references
- oeis: A253750