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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.

A365981 Expansion of e.g.f. 1 / ( 1 - Sum_{k>=0} x^(4*k+3) / (4*k+3) ).

Table of values

n a(n)
0 1
1 0
2 0
3 2
4 0
5 0
6 80
7 720
8 0
9 13440
10 345600
11 3628800
12 5913600
13 296524800
14 7062681600
15 92559667200
16 442810368000
17 18037334016000
18 459627769036800
19 7475081822208000
20 65867064606720000
21 2634706112643072000
22 74102151110787072000
23 1464478283948359680000

List of values

[1, 0, 0, 2, 0, 0, 80, 720, 0, 13440, 345600, 3628800, 5913600, 296524800, 7062681600, 92559667200, 442810368000, 18037334016000, 459627769036800, 7475081822208000, 65867064606720000, 2634706112643072000, 74102151110787072000, 1464478283948359680000]

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

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