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 | 6 |
| 4 | 24 |
| 5 | 100 |
| 6 | 586 |
| 7 | 3725 |
| 8 | 26532 |
| 9 | 198081 |
| 10 | 1539550 |
| 11 | 12274565 |
| 12 | 99959181 |
| 13 | 827795678 |
| 14 | 6954099320 |
| 15 | 59138955508 |
| 16 | 508331799502 |
| 17 | 4410651891166 |
| 18 | 38590663253312 |
| 19 | 340173195849485 |
| 20 | 3018768835038348 |
| 21 | 26952060900042852 |
| 22 | 241960993507098580 |
| 23 | 2183134755112963493 |
| 24 | 19788571100313277286 |