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 | 10 |
| 2 | 65 |
| 3 | 140 |
| 4 | 420 |
| 5 | 2100 |
| 6 | 2210 |
| 7 | 20737 |
| 8 | 32045 |
| 9 | 200725 |
| 10 | 207370 |
| 11 | 1204350 |
| 12 | 1347905 |
| 13 | 1762645 |
| 14 | 16502850 |
| 15 | 31427800 |
| 16 | 37741340 |
| 17 | 107671200 |
| 18 | 130643100 |
| 19 | 200728169 |
| 20 | 239719720 |
| 21 | 357491225 |
| 22 | 417225900 |
| 23 | 430085380 |
| 24 | 766750575 |
| 25 | 1088692500 |
| 26 | 1132409168 |
| 27 | 1328204850 |
| 28 | 1788379460 |