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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.

A332748 The number of permutations of {1,1,1,2,2,2,...,n,n,n} such that each triple of k's (k=1..n) is equally spaced with b(k) other elements in between and b(1) >= b(2) >= ... >= b(n).

Table of values

n a(n)
0 1
1 1
2 4
3 18
4 124
5 738
6 7464
7 55890
8 668778
9 7030210
10 90713844
11 1054221258
12 18597735744
13 242795838520

List of values

[1, 1, 4, 18, 124, 738, 7464, 55890, 668778, 7030210, 90713844, 1054221258, 18597735744, 242795838520]

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

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