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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.

A247070 Number of paths joining opposite corners of an n X 3 grid with every vertex appearing at most twice in the path.

Table of values

n a(n)
1 3
2 218
3 9482
4 457712
5 22375458
6 1103498043
7 54446999831
8 2687689834743
9 132666417488114
10 6548713810387879
11 323256199668617476
12 15956549284724388645
13 787645179268653581373
14 38879655000676000582023
15 1919173045780901708089448

List of values

[3, 218, 9482, 457712, 22375458, 1103498043, 54446999831, 2687689834743, 132666417488114, 6548713810387879, 323256199668617476, 15956549284724388645, 787645179268653581373, 38879655000676000582023, 1919173045780901708089448]

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

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