Number of nX4 arrays of the minimum value of corresponding elements and their horizontal, vertical, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 nX4 array.
A219911
Number of nX4 arrays of the minimum value of corresponding elements and their horizontal, vertical, diagonal or antidiagonal neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 nX4 array.
Terms
- a(0) =10a(1) =10a(2) =64a(3) =234a(4) =819a(5) =2563a(6) =7877a(7) =24318a(8) =74901a(9) =225552a(10) =655360a(11) =1830548a(12) =4926005a(13) =12823832a(14) =32424013a(15) =79868808a(16) =192101716a(17) =451939391a(18) =1041473168a(19) =2353902067a(20) =5224026485a(21) =11396161606a(22) =24460392989a(23) =51700266645a(24) =107691405332
External references
- oeis: A219911