A201533 - cp's OEIS frontend

A201533 Number of n X 2 0..2 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor.

n	a(n)
1	3
2	9
3	25
4	69
5	175
6	410
7	899
8	1859
9	3649
10	6840
11	12311
12	21378
13	35964
14	58819
15	93800
16	146222
17	223292
18	334639
19	492954
20	714755
21	1021293
22	1439616
23	2003809
24	2756429
25	3750155
26	5049674
27	6733825
28	8898024
29	11656994
30	15147825
31	19533390
32	25006144

[3, 9, 25, 69, 175, 410, 899, 1859, 3649, 6840, 12311, 21378, 35964, 58819, 93800, 146222, 223292, 334639, 492954, 714755, 1021293, 1439616, 2003809, 2756429, 3750155, 5049674, 6733825, 8898024, 11656994, 15147825, 19533390, 25006144]

cp's OEIS Frontend

A201533 Number of n X 2 0..2 arrays with rows and columns lexicographically nondecreasing and every element equal to at least one horizontal or vertical neighbor.

Table of values

List of values