Number of (n+1)X(3+1) 0..2 arrays with every 2X2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.
A253744
Number of (n+1)X(3+1) 0..2 arrays with every 2X2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.
Terms
- a(0) =1998a(1) =10182a(2) =77414a(3) =382973a(4) =1636717a(5) =5648005a(6) =17980643a(7) =52078415a(8) =140931619a(9) =357840627a(10) =868453186a(11) =2023764359a(12) =4558420081a(13) =9965846712a(14) =21261754665a(15) =44410393873a(16) =91091870910a(17) =183925891758a(18) =366444204565a(19) =721742419593
External references
- oeis: A253744