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 columnwise and nonincreasing rowwise.
A235768
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 columnwise and nonincreasing rowwise.
Terms
- a(0) =120a(1) =628a(2) =2994a(3) =12417a(4) =47501a(5) =166904a(6) =552444a(7) =1724793a(8) =5144350a(9) =14696712a(10) =40503441a(11) =107993795a(12) =279771656a(13) =706134649a(14) =1741178487a(15) =4204576953a(16) =9961571579a(17) =23204492256a(18) =53213406141a(19) =120352868718a(20) =268716844980a(21) =593201019964
External references
- oeis: A235768