Number of (n+1)X(2+1) 0..2 arrays with every 2X2 subblock ne-sw antidiagonal difference nondecreasing horizontally and nw+se diagonal sum nondecreasing vertically.
A253743
Number of (n+1)X(2+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) =16625a(3) =75959a(4) =305707a(5) =1087364a(6) =3598487a(7) =11219006a(8) =33417573a(9) =95950526a(10) =267699183a(11) =729912815a(12) =1953438640a(13) =5149262462a(14) =13406957125a(15) =34558018931a(16) =88348005194a(17) =224349137386a(18) =566585100420
External references
- oeis: A253743