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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.

A166135 Number of possible paths to each node that lies along the edge of a cut 4-nomial tree, that is rooted one unit from the cut.

Table of values

n a(n)
1 1
2 1
3 3
4 7
5 22
6 65
7 213
8 693
9 2352
10 8034
11 28014
12 98505
13 350548
14 1256827
15 4542395
16 16517631
17 60417708
18 222087320
19 820099720
20 3040555978
21 11314532376
22 42243332130
23 158196980682
24 594075563613
25 2236627194858
26 8440468925400
27 31921622746680
28 120970706601255

List of values

[1, 1, 3, 7, 22, 65, 213, 693, 2352, 8034, 28014, 98505, 350548, 1256827, 4542395, 16517631, 60417708, 222087320, 820099720, 3040555978, 11314532376, 42243332130, 158196980682, 594075563613, 2236627194858, 8440468925400, 31921622746680, 120970706601255]

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

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