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 | 0 |
| 2 | 9 |
| 3 | 32 |
| 4 | 179 |
| 5 | 1536 |
| 6 | 10374 |
| 7 | 78932 |
| 8 | 592064 |
| 9 | 4449947 |
| 10 | 33577057 |
| 11 | 252998551 |
| 12 | 1907641285 |
| 13 | 14383151007 |
| 14 | 108443795304 |
| 15 | 817656870230 |
| 16 | 6165008746020 |
| 17 | 46483483392723 |
| 18 | 350480396736512 |
| 19 | 2642584867743746 |
| 20 | 19924815133356634 |