cp's OEIS Frontend

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.

A177321 Number of permutations of n copies of 1..9 with all adjacent differences <= 1 in absolute value.

Table of values

n a(n)
0 1
1 2
2 416
3 664958
4 1792874048
5 6232521421502
6 25328979140590460
7 114573118435555703030
8 560523113474283819256640
9 2911820015993491302722966990
10 15861703283168731825003935183416
11 89796737967084981726163781067177194
12 524830705066715697873367329722967841532

List of values

[1, 2, 416, 664958, 1792874048, 6232521421502, 25328979140590460, 114573118435555703030, 560523113474283819256640, 2911820015993491302722966990, 15861703283168731825003935183416, 89796737967084981726163781067177194, 524830705066715697873367329722967841532]

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

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