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.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 31 |
| 3 | 91 |
| 4 | 211 |
| 5 | 451 |
| 6 | 931 |
| 7 | 1891 |
| 8 | 3811 |
| 9 | 7651 |
| 10 | 15331 |
| 11 | 30691 |
| 12 | 61411 |
| 13 | 122851 |
| 14 | 245731 |
| 15 | 491491 |
| 16 | 983011 |
| 17 | 1966051 |
| 18 | 3932131 |
| 19 | 7864291 |
| 20 | 15728611 |
| 21 | 31457251 |
| 22 | 62914531 |
| 23 | 125829091 |
| 24 | 251658211 |
| 25 | 503316451 |
| 26 | 1006632931 |
| 27 | 2013265891 |
| 28 | 4026531811 |
| 29 | 8053063651 |
| 30 | 16106127331 |