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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.

A348009 Number of n-step self-avoiding walks on one quadrant of a 2D square lattice where the walk cannot step to the smaller square ring of numbers than the ring it is currently on.

Table of values

n a(n)
0 1
1 2
2 4
3 10
4 22
5 52
6 118
7 282
8 646
9 1544
10 3576
11 8546
12 19924
13 47612
14 111536
15 266488
16 626520
17 1496670
18 3528470
19 8427952
20 19913078
21 47559756
22 112572916
23 268857568
24 637327742
25 1522153378
26 3612811784
27 8629110414
28 20503211908
29 48975965026
30 116478744692

List of values

[1, 2, 4, 10, 22, 52, 118, 282, 646, 1544, 3576, 8546, 19924, 47612, 111536, 266488, 626520, 1496670, 3528470, 8427952, 19913078, 47559756, 112572916, 268857568, 637327742, 1522153378, 3612811784, 8629110414, 20503211908, 48975965026, 116478744692]

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

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