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 | 5 |
| 2 | 25 |
| 3 | 85 |
| 4 | 255 |
| 5 | 651 |
| 6 | 1519 |
| 7 | 3235 |
| 8 | 6470 |
| 9 | 12190 |
| 10 | 21942 |
| 11 | 37854 |
| 12 | 63090 |
| 13 | 101850 |
| 14 | 160050 |
| 15 | 245322 |
| 16 | 367983 |
| 17 | 541035 |
| 18 | 781495 |
| 19 | 1110395 |
| 20 | 1554553 |
| 21 | 2146573 |
| 22 | 2927145 |
| 23 | 3945045 |
| 24 | 5260060 |
| 25 | 6942988 |
| 26 | 9079292 |
| 27 | 11769100 |
| 28 | 15131700 |
| 29 | 19305540 |