Number of (n+1)X(3+1) 0..1 arrays with the sum of each 2X2 subblock two extreme terms minus its two median terms lexicographically nondecreasing rowwise and columnwise.
A235551
Number of (n+1)X(3+1) 0..1 arrays with the sum of each 2X2 subblock two extreme terms minus its two median terms lexicographically nondecreasing rowwise and columnwise.
Terms
- a(0) =120a(1) =814a(2) =5567a(3) =33851a(4) =184281a(5) =892122a(6) =3925717a(7) =15834473a(8) =59506551a(9) =209811804a(10) =701617754a(11) =2235893345a(12) =6840089137a(13) =20153696074a(14) =57486754527a(15) =159114503083a(16) =428959896263
External references
- oeis: A235551