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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.

A357949 a(n) = Sum_{k=0..floor(n/4)} (n-3*k)!/k!.

Table of values

n a(n)
0 1
1 1
2 2
3 6
4 25
5 122
6 726
7 5064
8 40441
9 363603
10 3633852
11 39957180
12 479364841
13 6230652124
14 87218228180
15 1308153551160
16 20929018724041
17 355774626352325
18 6403681619657310
19 121666026312835410
20 2433257739200536081
21 51097345199332200726
22 1124122383340449444042

List of values

[1, 1, 2, 6, 25, 122, 726, 5064, 40441, 363603, 3633852, 39957180, 479364841, 6230652124, 87218228180, 1308153551160, 20929018724041, 355774626352325, 6403681619657310, 121666026312835410, 2433257739200536081, 51097345199332200726, 1124122383340449444042]

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

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