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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.

A069640 Let M_n be the n X n matrix with M_n(i,j)=1/(i+j+1); then a(n)=1/det(M_n).

Table of values

n a(n)
1 3
2 240
3 378000
4 10668672000
5 5175372787200000
6 42202225467872870400000
7 5708700736339601341845504000000
8 12701009683686045652926579789004800000000
9 462068939479146913162956288390362787269836800000000

List of values

[3, 240, 378000, 10668672000, 5175372787200000, 42202225467872870400000, 5708700736339601341845504000000, 12701009683686045652926579789004800000000, 462068939479146913162956288390362787269836800000000]

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

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