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 | 4 |
| 3 | 34 |
| 4 | 151 |
| 5 | 1291 |
| 6 | 5734 |
| 7 | 49024 |
| 8 | 217741 |
| 9 | 1861621 |
| 10 | 8268424 |
| 11 | 70692574 |
| 12 | 313982371 |
| 13 | 2684456191 |
| 14 | 11923061674 |
| 15 | 101938642684 |
| 16 | 452762361241 |
| 17 | 3870983965801 |
| 18 | 17193046665484 |
| 19 | 146995452057754 |
| 20 | 652883010927151 |
| 21 | 5581956194228851 |
| 22 | 24792361368566254 |