A211842 - cp's OEIS frontend

A211842 Number of nonnegative integer arrays of length n+3 with new values 0 upwards introduced in order, no three adjacent elements all unequal, and containing the value 2.

n	a(n)
1	1
2	5
3	19
4	63
5	196
6	588
7	1731
8	5049
9	14689
10	42809
11	125364
12	369678
13	1099339
14	3300091
15	10006487
16	30658799
17	94932890
18	297079702
19	939477265
20	3001846219
21	9689289277
22	31586215805
23	103968208826
24	345457027212
25	1158435912189
26	3919502591649

[1, 5, 19, 63, 196, 588, 1731, 5049, 14689, 42809, 125364, 369678, 1099339, 3300091, 10006487, 30658799, 94932890, 297079702, 939477265, 3001846219, 9689289277, 31586215805, 103968208826, 345457027212, 1158435912189, 3919502591649]

cp's OEIS Frontend

A211842 Number of nonnegative integer arrays of length n+3 with new values 0 upwards introduced in order, no three adjacent elements all unequal, and containing the value 2.

Table of values

List of values