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This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A338230 Number of ternary strings of length n that contain at least two 0's and at most one 1.

Table of values

n a(n)
0 0
1 0
2 1
3 7
4 27
5 81
6 213
7 519
8 1207
9 2725
10 6033
11 13179
12 28515
13 61257
14 130861
15 278287
16 589551
17 1244877
18 2621097
19 5504643
20 11533915
21 24116785
22 50331141
23 104857047
24 218103207
25 452984181
26 939523393
27 1946156299
28 4026531027
29 8321498265
30 17179868253
31 35433479199
32 73014442975
33 150323854237

List of values

[0, 0, 1, 7, 27, 81, 213, 519, 1207, 2725, 6033, 13179, 28515, 61257, 130861, 278287, 589551, 1244877, 2621097, 5504643, 11533915, 24116785, 50331141, 104857047, 218103207, 452984181, 939523393, 1946156299, 4026531027, 8321498265, 17179868253, 35433479199, 73014442975, 150323854237]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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