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 | 15 |
| 2 | 113 |
| 3 | 575 |
| 4 | 2241 |
| 5 | 7183 |
| 6 | 19825 |
| 7 | 48639 |
| 8 | 108545 |
| 9 | 224143 |
| 10 | 433905 |
| 11 | 795455 |
| 12 | 1392065 |
| 13 | 2340495 |
| 14 | 3800305 |
| 15 | 5984767 |
| 16 | 9173505 |
| 17 | 13726991 |
| 18 | 20103025 |
| 19 | 28875327 |
| 20 | 40754369 |
| 21 | 56610575 |
| 22 | 77500017 |
| 23 | 104692735 |
| 24 | 139703809 |
| 25 | 184327311 |
| 26 | 240673265 |
| 27 | 311207743 |
| 28 | 398796225 |
| 29 | 506750351 |