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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.

A203849 a(n) = sigma_2(n)*Fibonacci(n), where sigma_2(n) = A001157(n), the sum of squares of divisors of n.

Table of values

n a(n)
1 1
2 5
3 20
4 63
5 130
6 400
7 650
8 1785
9 3094
10 7150
11 10858
12 30240
13 39610
14 94250
15 158600
16 336567
17 463130
18 1175720
19 1513522
20 3693690
21 5473000
22 10803710
23 15188210
24 39412800
25 48841275
26 103184050
27 161062760
28 333701550
29 432980818
30 1081652000
31 1295110778
32 2973391785
33 4299985160

List of values

[1, 5, 20, 63, 130, 400, 650, 1785, 3094, 7150, 10858, 30240, 39610, 94250, 158600, 336567, 463130, 1175720, 1513522, 3693690, 5473000, 10803710, 15188210, 39412800, 48841275, 103184050, 161062760, 333701550, 432980818, 1081652000, 1295110778, 2973391785, 4299985160]

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

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