A219590 - cp's OEIS frontend

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.

n	a(n)
1	6
2	18
3	84
4	264
5	705
6	1739
7	4129
8	9518
9	21271
10	46019
11	96412
12	195879
13	386603
14	742477
15	1389545
16	2537385
17	4526097
18	7895059
19	13481452
20	22558778
21	37028253
22	59679103
23	94537481
24	147328016
25	226076963
26	341891611
27	509957092
28	750799089
29	1091869239

[6, 18, 84, 264, 705, 1739, 4129, 9518, 21271, 46019, 96412, 195879, 386603, 742477, 1389545, 2537385, 4526097, 7895059, 13481452, 22558778, 37028253, 59679103, 94537481, 147328016, 226076963, 341891611, 509957092, 750799089, 1091869239]

cp's OEIS Frontend

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.

Table of values

List of values