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.

A321065 Number of ordered pairs (p,q) of permutations of [n] with equal up-down signatures and p(1)=q(1)=9.

Table of values

n a(n)
9 23136128
10 873274112
11 43316046592
12 2700561836672
13 205352644205568
14 18629724957708800
15 1982309731660474368
16 244043425473888612352
17 34372758116984213536768
18 5486719044572824902107136
19 984593144718697864983347200
20 197245981020715237398610116608

List of values

[23136128, 873274112, 43316046592, 2700561836672, 205352644205568, 18629724957708800, 1982309731660474368, 244043425473888612352, 34372758116984213536768, 5486719044572824902107136, 984593144718697864983347200, 197245981020715237398610116608]

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

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