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.

A272988 Convolution of the sequence of derangement numbers A000166 with itself.

Table of values

n a(n)
0 1
1 0
2 2
3 4
4 19
5 92
6 552
7 3832
8 30453
9 272552
10 2713710
11 29752156
12 356133959
13 4620985700
14 64600445812
15 967927029168
16 15473320537001
17 262864036323600
18 4728905854617562
19 89808092596277364
20 1795480569403712699
21 37693097921348983852
22 829024574048725950016
23 19063166411687276701736

List of values

[1, 0, 2, 4, 19, 92, 552, 3832, 30453, 272552, 2713710, 29752156, 356133959, 4620985700, 64600445812, 967927029168, 15473320537001, 262864036323600, 4728905854617562, 89808092596277364, 1795480569403712699, 37693097921348983852, 829024574048725950016, 19063166411687276701736]

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

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