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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.

A333760 Number of self-avoiding closed paths in the 4 X n grid graph which pass through all vertices on four (left, right, upper, lower) sides of the graph.

Table of values

n a(n)
2 1
3 3
4 11
5 36
6 122
7 408
8 1371
9 4599
10 15437
11 51804
12 173860
13 583476
14 1958173
15 6571695
16 22054863
17 74016936
18 248403622
19 833651844
20 2797766831
21 9389410251
22 31511212505
23 105752809368
24 354910389192
25 1191092559048
26 3997351239929
27 13415260479675
28 45022116630931

List of values

[1, 3, 11, 36, 122, 408, 1371, 4599, 15437, 51804, 173860, 583476, 1958173, 6571695, 22054863, 74016936, 248403622, 833651844, 2797766831, 9389410251, 31511212505, 105752809368, 354910389192, 1191092559048, 3997351239929, 13415260479675, 45022116630931]

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

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