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) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 22 |
| 3 | 87 |
| 4 | 317 |
| 5 | 1053 |
| 6 | 3250 |
| 7 | 9343 |
| 8 | 25207 |
| 9 | 64167 |
| 10 | 155004 |
| 11 | 357009 |
| 12 | 787586 |
| 13 | 1670643 |
| 14 | 3419552 |
| 15 | 6774765 |
| 16 | 13027340 |
| 17 | 24372942 |
| 18 | 44462456 |
| 19 | 79240762 |
| 20 | 138204782 |
| 21 | 236258358 |
| 22 | 396409924 |
| 23 | 653639898 |
| 24 | 1060379169 |
| 25 | 1694174350 |
| 26 | 2668300758 |
| 27 | 4146300078 |
| 28 | 6361709115 |
| 29 | 9644583474 |