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.

A249461 Number of length n+4 0..3 arrays with no five consecutive terms having four times any element equal to the sum of the remaining four.

Table of values

n a(n)
1 860
2 2948
3 10124
4 34832
5 119932
6 412972
7 1422232
8 4898776
9 16874830
10 58131580
11 200257200
12 689871586
13 2376578686
14 8187255382
15 28204984386
16 97165888404
17 334735779168
18 1153163060226
19 3972642458048
20 13685741942400
21 47147347303294

List of values

[860, 2948, 10124, 34832, 119932, 412972, 1422232, 4898776, 16874830, 58131580, 200257200, 689871586, 2376578686, 8187255382, 28204984386, 97165888404, 334735779168, 1153163060226, 3972642458048, 13685741942400, 47147347303294]

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

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