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 | 2 |
| 2 | 5 |
| 3 | 13 |
| 4 | 33 |
| 5 | 84 |
| 6 | 214 |
| 7 | 545 |
| 8 | 1388 |
| 9 | 3535 |
| 10 | 9003 |
| 11 | 22929 |
| 12 | 58396 |
| 13 | 148724 |
| 14 | 378773 |
| 15 | 964666 |
| 16 | 2456829 |
| 17 | 6257097 |
| 18 | 15935689 |
| 19 | 40585304 |
| 20 | 103363394 |
| 21 | 263247781 |
| 22 | 670444260 |
| 23 | 1707499695 |
| 24 | 4348691431 |
| 25 | 11075326817 |
| 26 | 28206844760 |
| 27 | 71837707768 |
| 28 | 182957587113 |
| 29 | 465959726754 |