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 | 2 |
| 3 | 3 |
| 4 | 5 |
| 5 | 15 |
| 6 | 20 |
| 7 | 75 |
| 8 | 93 |
| 9 | 588 |
| 10 | 602 |
| 11 | 4954 |
| 12 | 4854 |
| 13 | 51068 |
| 14 | 48779 |
| 15 | 597554 |
| 16 | 567644 |
| 17 | 8039742 |
| 18 | 7634924 |
| 19 | 120721322 |
| 20 | 114398957 |
| 21 | 2017517155 |
| 22 | 1889828995 |
| 23 | 36749338386 |
| 24 | 34451341024 |
| 25 | 726198499999 |
| 26 | 679116640274 |
| 27 | 15459385244039 |
| 28 | 14509756794668 |
| 29 | 356501015466981 |
| 30 | 332645434167718 |
| 31 | 8701627694048482 |