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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.

A145156 Number of Greek-key tours on a 5 X n board; i.e., self-avoiding walks on 5 X n grid starting in top left corner.

Table of values

n a(n)
1 1
2 5
3 38
4 160
5 824
6 3501
7 16262
8 68591
9 304177
10 1276805
11 5522791
12 23117164
13 98562435
14 411870513
15 1740941765
16 7267608829
17 30557297042
18 127482101761
19 534250130959
20 2227966210989
21 9317736040747
22 38847892461656
23 162258421050635
24 676389635980185
25 2822813259030961
26 11766012342819549

List of values

[1, 5, 38, 160, 824, 3501, 16262, 68591, 304177, 1276805, 5522791, 23117164, 98562435, 411870513, 1740941765, 7267608829, 30557297042, 127482101761, 534250130959, 2227966210989, 9317736040747, 38847892461656, 162258421050635, 676389635980185, 2822813259030961, 11766012342819549]

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

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