cp's OEIS Frontend

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.

A213458 Number of 0..3 arrays of length n+3 with sum less than 6 in any length 4 subsequence (=less than 50% duty cycle).

Table of values

n a(n)
1 106
2 310
3 927
4 2735
5 7803
6 22506
7 65425
8 190318
9 551598
10 1597812
11 4632940
12 13439852
13 38977905
14 113018097
15 327714656
16 950345164
17 2755932228
18 7991769082
19 23174685375
20 67202984107
21 194879111652
22 565120621828
23 1638762823886

List of values

[106, 310, 927, 2735, 7803, 22506, 65425, 190318, 551598, 1597812, 4632940, 13439852, 38977905, 113018097, 327714656, 950345164, 2755932228, 7991769082, 23174685375, 67202984107, 194879111652, 565120621828, 1638762823886]

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

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