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.

A000506 One half of the number of permutations of [n] such that the differences have 5 runs with the same signs.

Table of values

n a(n)
6 61
7 841
8 7311
9 51663
10 325446
11 1910706
12 10715506
13 58258210
14 309958755
15 1623847695
16 8412276585
17 43220104041
18 220683627988
19 1121561317408
20 5679711010548
21 28683869195556
22 144552802373145
23 727271783033445

List of values

[61, 841, 7311, 51663, 325446, 1910706, 10715506, 58258210, 309958755, 1623847695, 8412276585, 43220104041, 220683627988, 1121561317408, 5679711010548, 28683869195556, 144552802373145, 727271783033445]

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

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