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.

A246249 Number of permutations of [n] with exactly four occurrences of the consecutive step pattern up, down, down.

Table of values

n a(n)
13 3052323
14 186723630
15 7683652710
16 260901740745
17 8002149813810
18 231524173618290
19 6486876741415365
20 178899784802719290
21 4910005699045578270
22 135118835430805648215
23 3748167756629344500390
24 105205858082972481706290
25 2996195115836815163207370

List of values

[3052323, 186723630, 7683652710, 260901740745, 8002149813810, 231524173618290, 6486876741415365, 178899784802719290, 4910005699045578270, 135118835430805648215, 3748167756629344500390, 105205858082972481706290, 2996195115836815163207370]

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

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