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.

A147630 a(1) = 1; for n>1, a(n) = Product_{k = 1..n-1} (9k - 3).

Table of values

n a(n)
1 1
2 6
3 90
4 2160
5 71280
6 2993760
7 152681760
8 9160905600
9 632102486400
10 49303993939200
11 4289447472710400
12 411786957380198400
13 43237630524920832000
14 4929089879840974848000
15 606278055220439906304000
16 80028703289098067632128000
17 11284047163762827536130048000

List of values

[1, 6, 90, 2160, 71280, 2993760, 152681760, 9160905600, 632102486400, 49303993939200, 4289447472710400, 411786957380198400, 43237630524920832000, 4929089879840974848000, 606278055220439906304000, 80028703289098067632128000, 11284047163762827536130048000]

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

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