Number of (n+1) X (2+1) 0..1 arrays with every 2 X 2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically.
A253225
Number of (n+1) X (2+1) 0..1 arrays with every 2 X 2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically.
Terms
- a(0) =47a(1) =132a(2) =306a(3) =742a(4) =1775a(5) =4158a(6) =9551a(7) =21591a(8) =48179a(9) =106371a(10) =232787a(11) =505683a(12) =1091603a(13) =2343699a(14) =5008403a(15) =10658835a(16) =22601747a(17) =47771667a(18) =100679699a(19) =211632147a(20) =443809811a(21) =928710675a(22) =1939603475a(23) =4043571219a(24) =8415870995a(25) =17489199123
External references
- oeis: A253225