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 | 7 |
| 1 | 51 |
| 2 | 387 |
| 3 | 2943 |
| 4 | 22383 |
| 5 | 170235 |
| 6 | 1294731 |
| 7 | 9847143 |
| 8 | 74892951 |
| 9 | 569602179 |
| 10 | 4332138579 |
| 11 | 32948302095 |
| 12 | 250590001023 |
| 13 | 1905875101899 |
| 14 | 14495230812123 |
| 15 | 110244221191287 |
| 16 | 838468077093927 |
| 17 | 6377011953177555 |
| 18 | 48500691394138659 |
| 19 | 368874495293576607 |
| 20 | 2805493888166196879 |
| 21 | 21337327619448845211 |