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 | 6 |
| 2 | 37 |
| 3 | 232 |
| 4 | 1471 |
| 5 | 9402 |
| 6 | 60460 |
| 7 | 390656 |
| 8 | 2533987 |
| 9 | 16489546 |
| 10 | 107594213 |
| 11 | 703680424 |
| 12 | 4611412196 |
| 13 | 30273024984 |
| 14 | 199045392232 |
| 15 | 1310535994368 |
| 16 | 8639411571051 |
| 17 | 57017083602138 |
| 18 | 376674527189599 |
| 19 | 2490742704227192 |
| 20 | 16483857933928471 |
| 21 | 109175823528400778 |
| 22 | 723611538997758784 |