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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.

A320957 a(n) = (1/6)*n!*[x^n] (2 + sec(3*x) + tan(3*x) + 3*sec(x) + 3*tan(x)).

Table of values

n a(n)
0 1
1 1
2 2
3 10
4 70
5 656
6 7442
7 99280
8 1515190
9 26038016
10 497227682
11 10445708800
12 239394707110
13 5943715352576
14 158922998335922
15 4552807055288320
16 139123511874743830
17 4517007538261262336
18 155283277843358756162
19 5634815061983539363840
20 215234080472925069593350

List of values

[1, 1, 2, 10, 70, 656, 7442, 99280, 1515190, 26038016, 497227682, 10445708800, 239394707110, 5943715352576, 158922998335922, 4552807055288320, 139123511874743830, 4517007538261262336, 155283277843358756162, 5634815061983539363840, 215234080472925069593350]

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

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