Number of (n+1) X (1+1) 0..1 arrays with the sum of each 2 X 2 subblock two median terms lexicographically nondecreasing rowwise and columnwise.
A235541
Number of (n+1) X (1+1) 0..1 arrays with the sum of each 2 X 2 subblock two median terms lexicographically nondecreasing rowwise and columnwise.
Terms
- a(0) =16a(1) =48a(2) =141a(3) =378a(4) =988a(5) =2482a(6) =6109a(7) =14712a(8) =34896a(9) =81612a(10) =188725a(11) =432046a(12) =980620a(13) =2208798a(14) =4941909a(15) =10990620a(16) =24311440a(17) =53516200a(18) =117285181a(19) =256007874a(20) =556755036a(21) =1206716778a(22) =2607303661a(23) =5617260448a(24) =12069653488a(25) =25869224292
External references
- oeis: A235541