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 | 9 |
| 3 | 35 |
| 4 | 210 |
| 5 | 1083 |
| 6 | 6253 |
| 7 | 37518 |
| 8 | 222705 |
| 9 | 1331099 |
| 10 | 7986594 |
| 11 | 47871651 |
| 12 | 287102581 |
| 13 | 1722615486 |
| 14 | 10334532969 |
| 15 | 62003849075 |
| 16 | 372023094450 |
| 17 | 2232108315723 |
| 18 | 13392560190013 |
| 19 | 80355361140078 |
| 20 | 482131358602785 |