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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.

A203797 a(n) = Pell(n) * Sum_{d|n} 1/Pell(d), where Pell(n) = A000129(n).

Table of values

n a(n)
1 1
2 3
3 6
4 19
5 30
6 120
7 170
8 647
9 1183
10 3650
11 5742
12 24916
13 33462
14 121652
15 240756
16 746639
17 1136690
18 4707147
19 6625110
20 25882770
21 46565244
22 139849776
23 225058682
24 978088748
25 1356970471
26 4750318586
27 9182205852
28 29333908544
29 44560482150
30 188175715440
31 259717522850
32 994309609247

List of values

[1, 3, 6, 19, 30, 120, 170, 647, 1183, 3650, 5742, 24916, 33462, 121652, 240756, 746639, 1136690, 4707147, 6625110, 25882770, 46565244, 139849776, 225058682, 978088748, 1356970471, 4750318586, 9182205852, 29333908544, 44560482150, 188175715440, 259717522850, 994309609247]

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

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