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.

A321987 Number of permutations of n copies of 1..9 introduced in order 1..9 with no element equal to another within a distance of 1.

Table of values

n a(n)
1 1
2 12310199
3 372419001449076
4 16904301142107043464659
5 967335448974819561548523580438
6 64311863997340571475504065539218471107
7 4749303210651587675797285013227098386984170468
8 379065045836307787068046364731543393514652159389593652

List of values

[1, 12310199, 372419001449076, 16904301142107043464659, 967335448974819561548523580438, 64311863997340571475504065539218471107, 4749303210651587675797285013227098386984170468, 379065045836307787068046364731543393514652159389593652]

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

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