Number of (n+1)X(4+1) 0..2 arrays with every 2X2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically.
A253520
Number of (n+1)X(4+1) 0..2 arrays with every 2X2 subblock diagonal minimum minus antidiagonal minimum nondecreasing horizontally and diagonal maximum minus antidiagonal maximum nondecreasing vertically.
Terms
- a(0) =9623a(1) =42476a(2) =84684a(3) =162815a(4) =370028a(5) =930046a(6) =2475610a(7) =6886675a(8) =19760474a(9) =57829329a(10) =171202242a(11) =510066284a(12) =1524744975a(13) =4565782480a(14) =13684014725a(15) =41030420257a(16) =123054948304a(17) =369101554371
External references
- oeis: A253520