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 | 5 |
| 3 | 15 |
| 4 | 45 |
| 5 | 105 |
| 6 | 264 |
| 7 | 555 |
| 8 | 1221 |
| 9 | 2445 |
| 10 | 4935 |
| 11 | 9324 |
| 12 | 17941 |
| 13 | 32522 |
| 14 | 59400 |
| 15 | 104808 |
| 16 | 184569 |
| 17 | 315711 |
| 18 | 540540 |
| 19 | 902335 |
| 20 | 1504800 |
| 21 | 2462724 |
| 22 | 4014513 |
| 23 | 6444425 |
| 24 | 10316250 |
| 25 | 16283707 |
| 26 | 25610886 |
| 27 | 39841865 |
| 28 | 61720659 |
| 29 | 94687230 |
| 30 | 144731706 |
| 31 | 219282679 |
| 32 | 330996105 |
| 33 | 495901413 |
| 34 | 740046425 |