cp's OEIS Frontend

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.

A225904 Numerator of Sum_{k=1..n} 1/L(k) where L(n) is the n-th Lucas number (A000204).

Table of values

n a(n)
1 1
2 4
3 19
4 145
5 1679
6 5191
7 153311
8 7286005
9 69689327
10 2869226821
11 572447760301
12 6593608277800
13 3438637721790797
14 966842075996112436
15 119933240206586434591
16 264753799412041684949165
17 945570749875765527295137611
18 303554979754466691916744807193

List of values

[1, 4, 19, 145, 1679, 5191, 153311, 7286005, 69689327, 2869226821, 572447760301, 6593608277800, 3438637721790797, 966842075996112436, 119933240206586434591, 264753799412041684949165, 945570749875765527295137611, 303554979754466691916744807193]

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

Content is available under The OEIS End-User License Agreement.