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.

A152504 1/10 of the number of permutations of 4 indistinguishable copies of 1..n with exactly 2 local maxima.

Table of values

n a(n)
1 0
2 3
3 140
4 5175
5 183000
6 6416875
7 224662500
8 7863609375
9 275228750000
10 9633019921875
11 337155773437500
12 11800452490234375
13 413015839453125000
14 14455554393310546875
15 505944403833007812500
16 17708054134515380859375
17 619781894709960937500000
18 21692366314858856201171875

List of values

[0, 3, 140, 5175, 183000, 6416875, 224662500, 7863609375, 275228750000, 9633019921875, 337155773437500, 11800452490234375, 413015839453125000, 14455554393310546875, 505944403833007812500, 17708054134515380859375, 619781894709960937500000, 21692366314858856201171875]

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

Content is available under The OEIS End-User License Agreement.