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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.

A327998 a(n) = (n!/floor(n/2)!^2)^2.

Table of values

n a(n)
0 1
1 1
2 4
3 36
4 36
5 900
6 400
7 19600
8 4900
9 396900
10 63504
11 7683984
12 853776
13 144288144
14 11778624
15 2650190400
16 165636900
17 47869064100
18 2363904400
19 853369488400
20 34134779536
21 15053437775376
22 497634306624
23 263248548204096
24 7312459672336
25 4570287295210000
26 108172480360000

List of values

[1, 1, 4, 36, 36, 900, 400, 19600, 4900, 396900, 63504, 7683984, 853776, 144288144, 11778624, 2650190400, 165636900, 47869064100, 2363904400, 853369488400, 34134779536, 15053437775376, 497634306624, 263248548204096, 7312459672336, 4570287295210000, 108172480360000]

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

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