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) |
|---|---|
| 2 | 1 |
| 3 | 8 |
| 4 | 41 |
| 5 | 208 |
| 6 | 856 |
| 7 | 3552 |
| 8 | 14172 |
| 9 | 56462 |
| 10 | 223292 |
| 11 | 881656 |
| 12 | 3475141 |
| 13 | 13688112 |
| 14 | 53891760 |
| 15 | 212145608 |
| 16 | 835111160 |
| 17 | 3287779006 |
| 18 | 12946154944 |
| 19 | 50989472460 |
| 20 | 200879577216 |
| 21 | 791617503410 |
| 22 | 3120501139160 |
| 23 | 12304529289928 |
| 24 | 48533074308046 |
| 25 | 191488113441258 |
| 26 | 755744827552836 |
| 27 | 2983563960355832 |