A229423 - cp's OEIS frontend

A229423 Number of n X 3 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, rows lexicographically nondecreasing, and columns lexicographically nonincreasing.

n	a(n)
1	8
2	27
3	83
4	222
5	524
6	1116
7	2187
8	4005
9	6936
10	11465
11	18219
12	27992
13	41772
14	60770
15	86451
16	120567
17	165192
18	222759
19	296099
20	388482
21	503660
22	645912
23	820091
24	1031673
25	1286808
26	1592373
27	1956027
28	2386268
29	2892492
30	3485054
31	4175331
32	4975787
33	5900040
34	6962931

[8, 27, 83, 222, 524, 1116, 2187, 4005, 6936, 11465, 18219, 27992, 41772, 60770, 86451, 120567, 165192, 222759, 296099, 388482, 503660, 645912, 820091, 1031673, 1286808, 1592373, 1956027, 2386268, 2892492, 3485054, 4175331, 4975787, 5900040, 6962931]

cp's OEIS Frontend

A229423 Number of n X 3 0..2 arrays with horizontal differences mod 3 never 1, vertical differences mod 3 never -1, rows lexicographically nondecreasing, and columns lexicographically nonincreasing.

Table of values

List of values