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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.

A060239 a(n) = determinant(P*Q)/n! where P, Q are n X n matrices with P[i,j]=lcm(i,j), Q[i,j]=gcd(i,j).

Table of values

n a(n)
1 1
2 -1
3 4
4 -8
5 128
6 512
7 -18432
8 73728
9 -884736
10 -14155776
11 1415577600
12 11324620800
13 -1630745395200
14 -58706834227200
15 -3757237390540800
16 30057899124326400
17 -7694822175827558400
18 -92337866109930700800

List of values

[1, -1, 4, -8, 128, 512, -18432, 73728, -884736, -14155776, 1415577600, 11324620800, -1630745395200, -58706834227200, -3757237390540800, 30057899124326400, -7694822175827558400, -92337866109930700800]

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

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