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.

A254620 a(n) = 9^n*(2*n + 1)!/n!.

Table of values

n a(n)
0 1
1 54
2 4860
3 612360
4 99202320
5 19642059360
6 4596241890240
7 1240985310364800
8 379741504971628800
9 129871594700297049600
10 49091462796712284748800
11 20323865597838885886003200
12 9145739519027498648701440000
13 4444829406247364343268899840000

List of values

[1, 54, 4860, 612360, 99202320, 19642059360, 4596241890240, 1240985310364800, 379741504971628800, 129871594700297049600, 49091462796712284748800, 20323865597838885886003200, 9145739519027498648701440000, 4444829406247364343268899840000]