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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.

A046995 Number of Greek-key tours on a 4 X n board; i.e., self-avoiding walks on 4 X n grid starting in top left corner.

Table of values

n a(n)
1 1
2 4
3 17
4 52
5 160
6 469
7 1337
8 3750
9 10347
10 28249
11 76382
12 204996
13 546651
14 1449952
15 3828232
16 10067585
17 26384939
18 68941126
19 179658343
20 467084601
21 1211812016
22 3138075544
23 8112667259
24 20941558268
25 53983767498
26 138989629481
27 357450757247
28 918350963486
29 2357213935865
30 6045360575469

List of values

[1, 4, 17, 52, 160, 469, 1337, 3750, 10347, 28249, 76382, 204996, 546651, 1449952, 3828232, 10067585, 26384939, 68941126, 179658343, 467084601, 1211812016, 3138075544, 8112667259, 20941558268, 53983767498, 138989629481, 357450757247, 918350963486, 2357213935865, 6045360575469]

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

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