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.

A302903 Number of permutations of [2n+1] having exactly n alternating descents.

Table of values

n a(n)
0 1
1 2
2 36
3 1196
4 76840
5 7570716
6 1085246904
7 211595659320
8 53984412657360
9 17440458896525180
10 6960292943873805976
11 3362366089440205308072
12 1933633403768889597292336
13 1305355624659052356741634136
14 1022196734801743485304805455920
15 919035074839303194470918726496240

List of values

[1, 2, 36, 1196, 76840, 7570716, 1085246904, 211595659320, 53984412657360, 17440458896525180, 6960292943873805976, 3362366089440205308072, 1933633403768889597292336, 1305355624659052356741634136, 1022196734801743485304805455920, 919035074839303194470918726496240]

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

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