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 | 22 |
| 2 | 484 |
| 3 | 5883 |
| 4 | 46613 |
| 5 | 273562 |
| 6 | 1285547 |
| 7 | 5087912 |
| 8 | 17557701 |
| 9 | 54161878 |
| 10 | 152154419 |
| 11 | 394849354 |
| 12 | 957192985 |
| 13 | 2187192034 |
| 14 | 4745347460 |
| 15 | 9834757897 |
| 16 | 19568773673 |
| 17 | 37541913638 |
| 18 | 69694254022 |
| 19 | 125590862829 |
| 20 | 220277446621 |
| 21 | 376922731034 |