A268952 - cp's OEIS frontend

A268952 Number of length-n 0..4 arrays with no repeated value equal to the previous repeated value, with new values introduced in sequential order.

n	a(n)
1	1
2	2
3	4
4	12
5	40
6	153
7	634
8	2785
9	12634
10	58409
11	272738
12	1280233
13	6024682
14	28383609
15	133772018
16	630473513
17	2970963898
18	13996752665
19	65924951490
20	310433985929
21	1461486107146
22	6879181490937
23	32374728610962
24	152339562845289

[1, 2, 4, 12, 40, 153, 634, 2785, 12634, 58409, 272738, 1280233, 6024682, 28383609, 133772018, 630473513, 2970963898, 13996752665, 65924951490, 310433985929, 1461486107146, 6879181490937, 32374728610962, 152339562845289]

cp's OEIS Frontend

A268952 Number of length-n 0..4 arrays with no repeated value equal to the previous repeated value, with new values introduced in sequential order.

Table of values

List of values