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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.

A347990 Number of n-step self-avoiding walks on 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 4
2 12
3 36
4 92
5 252
6 628
7 1644
8 4052
9 10340
10 25332
11 63708
12 155452
13 387036
14 941948
15 2328740
16 5657236
17 13914596
18 33757804
19 82713164
20 200467108
21 489746916
22 1186060492
23 2891000036
24 6997192716
25 17025058164
26 41186981772
27 100070851212
28 242000513660
29 587312389940

List of values

[1, 4, 12, 36, 92, 252, 628, 1644, 4052, 10340, 25332, 63708, 155452, 387036, 941948, 2328740, 5657236, 13914596, 33757804, 82713164, 200467108, 489746916, 1186060492, 2891000036, 6997192716, 17025058164, 41186981772, 100070851212, 242000513660, 587312389940]

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

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