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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.

A385312 a(n) is the number of ternary strings of length n with at least one 0, at least two 1's and at least three 2's.

Table of values

n a(n)
0 0
1 0
2 0
3 0
4 0
5 0
6 60
7 455
8 2268
9 9366
10 34800
11 121077
12 403392
13 1304732
14 4133220
15 12900771
16 39837684
17 122064930
18 371891592
19 1128317489
20 3412864056
21 10299925992
22 31033986588
23 93394501983
24 280818931020
25 843832511150
26 2534467085280
27 7609793357805
28 22843103816688
29 68558705110836

List of values

[0, 0, 0, 0, 0, 0, 60, 455, 2268, 9366, 34800, 121077, 403392, 1304732, 4133220, 12900771, 39837684, 122064930, 371891592, 1128317489, 3412864056, 10299925992, 31033986588, 93394501983, 280818931020, 843832511150, 2534467085280, 7609793357805, 22843103816688, 68558705110836]

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

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