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 | 1 |
| 2 | 5 |
| 3 | 23 |
| 4 | 101 |
| 5 | 377 |
| 6 | 1226 |
| 7 | 3507 |
| 8 | 9027 |
| 9 | 21224 |
| 10 | 46262 |
| 11 | 94512 |
| 12 | 182702 |
| 13 | 336666 |
| 14 | 595085 |
| 15 | 1014091 |
| 16 | 1673243 |
| 17 | 2682685 |
| 18 | 4192118 |
| 19 | 6401314 |
| 20 | 9572962 |
| 21 | 14047457 |
| 22 | 20260601 |
| 23 | 28763703 |
| 24 | 40247228 |
| 25 | 55567352 |
| 26 | 75776769 |
| 27 | 102158957 |
| 28 | 136267461 |
| 29 | 179969238 |
| 30 | 235493851 |
| 31 | 305487369 |