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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.

A247106 Number of paths joining opposite corners of an n X 4 grid with every vertex appearing at most twice in the path.

Table of values

n a(n)
1 5
2 2100
3 457712
4 112269228
5 28477328812
6 7318410460100
7 1890316186147022
8 488986474759870194
9 126570653719713453566
10 32767699501924700122356
11 8483817993681247935283336
12 2196573666944370207848161336
13 568727175315063817973036015946

List of values

[5, 2100, 457712, 112269228, 28477328812, 7318410460100, 1890316186147022, 488986474759870194, 126570653719713453566, 32767699501924700122356, 8483817993681247935283336, 2196573666944370207848161336, 568727175315063817973036015946]

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

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