A183721 - cp's OEIS frontend

A183721 1/12 the number of (n+1) X 2 0..5 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease, and at least two adjacent blocks having the same increasing direction.

n	a(n)
1	0
2	1
3	12
4	87
5	537
6	3070
7	16731
8	88331
9	455804
10	2311983
11	11571209
12	57295330
13	281223411
14	1370286715
15	6635743136
16	31964799247
17	153273890393
18	732031932806
19	3483896304443
20	16529018119643
21	78202676604548
22	369073777749215

[0, 1, 12, 87, 537, 3070, 16731, 88331, 455804, 2311983, 11571209, 57295330, 281223411, 1370286715, 6635743136, 31964799247, 153273890393, 732031932806, 3483896304443, 16529018119643, 78202676604548, 369073777749215]

cp's OEIS Frontend

A183721 1/12 the number of (n+1) X 2 0..5 arrays with every 2 X 2 subblock strictly increasing clockwise or counterclockwise with one decrease, and at least two adjacent blocks having the same increasing direction.

Table of values

List of values