Number of (7+1)X(n+1) 0..2 arrays with every 2X2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.

A253755

Number of (7+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) =315576a(1) =3598487a(2) =17980643a(3) =54890203a(4) =112645903a(5) =199063466a(6) =333213583a(7) =513292307a(8) =740160984a(9) =1027818060a(10) =1385679480a(11) =1806669395a(12) =2293619090a(13) =2872717479a(14) =3557550957a(15) =4334258426a(16) =5205864704a(17) =6210349284a(18) =7365404092

External references