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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.

A358698 Number of self-avoiding closed paths in the 7 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 21
4 408
5 6410
6 113748
7 2002405
8 35669433
9 633099244
10 11240647480
11 199480271184
12 3540336868535
13 62831861216325
14 1115122033297714
15 19790829247392636
16 351241699540793996
17 6233729269914805533
18 110634310753645173365
19 1963503651093439655818
20 34847658208568166865562
21 618465506517313482341986

List of values

[1, 21, 408, 6410, 113748, 2002405, 35669433, 633099244, 11240647480, 199480271184, 3540336868535, 62831861216325, 1115122033297714, 19790829247392636, 351241699540793996, 6233729269914805533, 110634310753645173365, 1963503651093439655818, 34847658208568166865562, 618465506517313482341986]

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

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