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 | 0 |
| 2 | 8 |
| 3 | 35 |
| 4 | 163 |
| 5 | 538 |
| 6 | 1618 |
| 7 | 4362 |
| 8 | 11018 |
| 9 | 26327 |
| 10 | 60327 |
| 11 | 133532 |
| 12 | 287324 |
| 13 | 603692 |
| 14 | 1243044 |
| 15 | 2515419 |
| 16 | 5013979 |
| 17 | 9863110 |
| 18 | 19176814 |
| 19 | 36900470 |
| 20 | 70348470 |
| 21 | 132999135 |
| 22 | 249552143 |
| 23 | 465041880 |
| 24 | 861196248 |
| 25 | 1585696248 |
| 26 | 2904335648 |
| 27 | 5293714067 |
| 28 | 9605482003 |