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 | 6 |
| 3 | 15 |
| 4 | 44 |
| 5 | 125 |
| 6 | 370 |
| 7 | 1099 |
| 8 | 3288 |
| 9 | 9849 |
| 10 | 29534 |
| 11 | 88583 |
| 12 | 265732 |
| 13 | 797173 |
| 14 | 2391498 |
| 15 | 7174467 |
| 16 | 21523376 |
| 17 | 64570097 |
| 18 | 193710262 |
| 19 | 581130751 |
| 20 | 1743392220 |
| 21 | 5230176621 |
| 22 | 15690529826 |
| 23 | 47071589435 |
| 24 | 141214768264 |
| 25 | 423644304745 |
| 26 | 1270932914190 |
| 27 | 3812798742519 |
| 28 | 11438396227508 |
| 29 | 34315188682469 |
| 30 | 102945566047354 |