Number of n X 3 arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 n X 3 array.
A219590
Number of n X 3 arrays of the minimum value of corresponding elements and their horizontal or vertical neighbors in a random, but sorted with lexicographically nondecreasing rows and nonincreasing columns, 0..2 n X 3 array.
Terms
- a(0) =6a(1) =18a(2) =84a(3) =264a(4) =705a(5) =1739a(6) =4129a(7) =9518a(8) =21271a(9) =46019a(10) =96412a(11) =195879a(12) =386603a(13) =742477a(14) =1389545a(15) =2537385a(16) =4526097a(17) =7895059a(18) =13481452a(19) =22558778a(20) =37028253a(21) =59679103a(22) =94537481a(23) =147328016a(24) =226076963a(25) =341891611a(26) =509957092a(27) =750799089a(28) =1091869239
External references
- oeis: A219590