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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.

A300589 a(n) = A300617(n) / (n*(n+1)/2) for n>=1.

Table of values

n a(n)
1 1
2 1
3 5
4 55
5 1025
6 28638
7 1117831
8 58157100
9 3895841625
10 327054041995
11 33660663702514
12 4170641243258042
13 612634528823952155
14 105303950053511041900
15 20943400410601239618360
16 4772694556432364600596272
17 1235587041134996933696367753
18 360653856192923791041427500825
19 117894515649092645422159124253775
20 42901062533218086978322192560871705

List of values

[1, 1, 5, 55, 1025, 28638, 1117831, 58157100, 3895841625, 327054041995, 33660663702514, 4170641243258042, 612634528823952155, 105303950053511041900, 20943400410601239618360, 4772694556432364600596272, 1235587041134996933696367753, 360653856192923791041427500825, 117894515649092645422159124253775, 42901062533218086978322192560871705]

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

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