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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.

A188978 Number of nX4 array permutations with each element moved but moved no more than a city block distance of two.

Table of values

n a(n)
1 4
2 900
3 295264
4 54113236
5 10523263424
6 2184414516364
7 446454227170968
8 90637093836201284
9 18447462299508458652
10 3757678170703167716673
11 765103415743509162801632
12 155767055441358236289145024

List of values

[4, 900, 295264, 54113236, 10523263424, 2184414516364, 446454227170968, 90637093836201284, 18447462299508458652, 3757678170703167716673, 765103415743509162801632, 155767055441358236289145024]

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

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