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 | 4 |
| 4 | 10 |
| 5 | 24 |
| 6 | 58 |
| 7 | 143 |
| 8 | 354 |
| 9 | 881 |
| 10 | 2204 |
| 11 | 5534 |
| 12 | 13940 |
| 13 | 35213 |
| 14 | 89162 |
| 15 | 226238 |
| 16 | 575114 |
| 17 | 1464382 |
| 18 | 3734150 |
| 19 | 9534594 |
| 20 | 24374230 |
| 21 | 62377881 |
| 22 | 159793932 |
| 23 | 409717004 |
| 24 | 1051405260 |
| 25 | 2700168229 |
| 26 | 6939388478 |
| 27 | 17845927498 |
| 28 | 45922416814 |
| 29 | 118238842174 |