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.

A098981 Total number of self-intersections of all n-step walks on the square lattice starting at the origin.

Table of values

n a(n)
0 0
1 0
2 4
3 32
4 212
5 1184
6 6256
7 31104
8 150612
9 707232
10 3270128
11 14845312
12 66716016
13 296203136
14 1305752896
15 5706772992
16 24810133076
17 107172696736
18 461076481904
19 1973848707456
20 8422716604400
21 35800153515904
22 151766977315136
23 641333362266624
24 2704240670895984

List of values

[0, 0, 4, 32, 212, 1184, 6256, 31104, 150612, 707232, 3270128, 14845312, 66716016, 296203136, 1305752896, 5706772992, 24810133076, 107172696736, 461076481904, 1973848707456, 8422716604400, 35800153515904, 151766977315136, 641333362266624, 2704240670895984]

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

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