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.

A152503 1/8 of the number of permutations of 3 indistinguishable copies of 1..n with exactly 6 local maxima.

Table of values

n a(n)
1 0
2 0
3 0
4 925
5 5134608
6 7080780596
7 5503883684118
8 3175651343215500
9 1543855504958661492
10 676391857775294288488
11 277604477433374392213008
12 109265969423431070616562496
13 41856404659462959845867172864
14 15752452465692536904424614273024
15 5860017184412283112523269770190848

List of values

[0, 0, 0, 925, 5134608, 7080780596, 5503883684118, 3175651343215500, 1543855504958661492, 676391857775294288488, 277604477433374392213008, 109265969423431070616562496, 41856404659462959845867172864, 15752452465692536904424614273024, 5860017184412283112523269770190848]

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

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