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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.

A344229 a(n) = n*a(n-1) + n^signum(n mod 4), a(0) = 1.

Table of values

n a(n)
0 1
1 2
2 6
3 21
4 85
5 430
6 2586
7 18109
8 144873
9 1303866
10 13038670
11 143425381
12 1721104573
13 22374359462
14 313241032482
15 4698615487245
16 75177847795921
17 1278023412530674
18 23004421425552150
19 437084007085490869
20 8741680141709817381
21 183575282975906165022

List of values

[1, 2, 6, 21, 85, 430, 2586, 18109, 144873, 1303866, 13038670, 143425381, 1721104573, 22374359462, 313241032482, 4698615487245, 75177847795921, 1278023412530674, 23004421425552150, 437084007085490869, 8741680141709817381, 183575282975906165022]

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

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