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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.

A358504 Number of genetic relatives of a person M in a genealogical tree extending back n generations and where everyone has 3 children down to the generation of M.

Table of values

n a(n)
0 1
1 5
2 25
3 137
4 793
5 4697
6 28057
7 168089
8 1008025
9 6047129
10 36280729
11 217680281
12 1306073497
13 7836424601
14 47018514841
15 282111023513
16 1692666010009
17 10155995797913
18 60935974263193
19 365615844530585
20 2193695065086361
21 13162170386323865
22 78973022309554585

List of values

[1, 5, 25, 137, 793, 4697, 28057, 168089, 1008025, 6047129, 36280729, 217680281, 1306073497, 7836424601, 47018514841, 282111023513, 1692666010009, 10155995797913, 60935974263193, 365615844530585, 2193695065086361, 13162170386323865, 78973022309554585]

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

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