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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.

A189020 a(n) = Sum_{k=1..10^n} tau_4(k), where tau_4 is the number of ordered factorizations into 4 factors (A007426).

Table of values

n a(n)
0 1
1 89
2 3575
3 93237
4 1951526
5 35270969
6 578262093
7 8840109380
8 128217432396
9 1784942188189
10 24045237260214
11 315312623543840
12 4042957241191810
13 50862246063060180
14 629513636928477232
15 7681900592647818929
16 92587253467765253144
17 1103781870246459696784
18 13031388731053572679450
19 152516435040764735691556
20 1771079109308495896176156

List of values

[1, 89, 3575, 93237, 1951526, 35270969, 578262093, 8840109380, 128217432396, 1784942188189, 24045237260214, 315312623543840, 4042957241191810, 50862246063060180, 629513636928477232, 7681900592647818929, 92587253467765253144, 1103781870246459696784, 13031388731053572679450, 152516435040764735691556, 1771079109308495896176156]

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

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