Number of (n+1)X(4+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing rowwise and nonincreasing columnwise.
A235409
Number of (n+1)X(4+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing rowwise and nonincreasing columnwise.
Terms
- a(0) =286a(1) =2302a(2) =20398a(3) =150862a(4) =1155953a(5) =7379380a(6) =48788187a(7) =273307984a(8) =1578043496a(9) =7881635316a(10) =40377942968a(11) =182401018359a(12) =842470282449
External references
- oeis: A235409