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 | 7 |
| 3 | 36 |
| 4 | 182 |
| 5 | 911 |
| 6 | 4557 |
| 7 | 22786 |
| 8 | 113932 |
| 9 | 569661 |
| 10 | 2848307 |
| 11 | 14241536 |
| 12 | 71207682 |
| 13 | 356038411 |
| 14 | 1780192057 |
| 15 | 8900960286 |
| 16 | 44504801432 |
| 17 | 222524007161 |
| 18 | 1112620035807 |
| 19 | 5563100179036 |
| 20 | 27815500895182 |
| 21 | 139077504475911 |
| 22 | 695387522379557 |