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.

A103885 a(n) = [x^(2*n)] ((1 + x)/(1 - x))^n.

Table of values

n a(n)
0 1
1 2
2 16
3 146
4 1408
5 14002
6 142000
7 1459810
8 15158272
9 158611106
10 1669752016
11 17664712562
12 187641279616
13 2000029880786
14 21380213588848
15 229129634462146
16 2460955893981184
17 26482855453375042
18 285475524009208720
19 3082024598888203090
20 33319523640218177408

List of values

[1, 2, 16, 146, 1408, 14002, 142000, 1459810, 15158272, 158611106, 1669752016, 17664712562, 187641279616, 2000029880786, 21380213588848, 229129634462146, 2460955893981184, 26482855453375042, 285475524009208720, 3082024598888203090, 33319523640218177408]

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

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