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.

A268137 a(n) = (1/n)*Sum_{k=0..n-1} A001850(k)*A245769(k).

Table of values

n a(n)
1 -1
2 1
3 31
4 417
5 5919
6 97217
7 1828479
8 38085249
9 853450367
10 20174707521
11 496690317855
12 12626836592289
13 329476040177439
14 8785359461936769
15 238587766484265471
16 6581966817521388033
17 184067922884292651519
18 5209333642085984431489
19 148992465188631205367071
20 4301514890878664802287777

List of values

[-1, 1, 31, 417, 5919, 97217, 1828479, 38085249, 853450367, 20174707521, 496690317855, 12626836592289, 329476040177439, 8785359461936769, 238587766484265471, 6581966817521388033, 184067922884292651519, 5209333642085984431489, 148992465188631205367071, 4301514890878664802287777]