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 | 3 |
| 2 | 19 |
| 3 | 96 |
| 4 | 453 |
| 5 | 2085 |
| 6 | 9513 |
| 7 | 43323 |
| 8 | 197542 |
| 9 | 903141 |
| 10 | 4142565 |
| 11 | 19067202 |
| 12 | 88065360 |
| 13 | 408108285 |
| 14 | 1897265405 |
| 15 | 8846769300 |
| 16 | 41368049400 |
| 17 | 193950461985 |
| 18 | 911564782065 |
| 19 | 4294230794520 |
| 20 | 20273068467725 |
| 21 | 95902496669091 |
| 22 | 454528832324919 |