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 | 1 |
| 3 | 4 |
| 4 | 7 |
| 5 | 15 |
| 6 | 32 |
| 7 | 65 |
| 8 | 137 |
| 9 | 284 |
| 10 | 591 |
| 11 | 1231 |
| 12 | 2560 |
| 13 | 5329 |
| 14 | 11089 |
| 15 | 23076 |
| 16 | 48023 |
| 17 | 99935 |
| 18 | 207968 |
| 19 | 432785 |
| 20 | 900633 |
| 21 | 1874236 |
| 22 | 3900319 |
| 23 | 8116639 |
| 24 | 16890880 |
| 25 | 35150241 |
| 26 | 73148321 |
| 27 | 152223044 |
| 28 | 316779047 |
| 29 | 659223215 |
| 30 | 1371856032 |
| 31 | 2854858465 |