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 | 1 |
| 2 | 7 |
| 3 | 46 |
| 4 | 427 |
| 5 | 4266 |
| 6 | 56424 |
| 7 | 772888 |
| 8 | 12882984 |
| 9 | 226946552 |
| 10 | 4546150566 |
| 11 | 95857685949 |
| 12 | 2267911223257 |
| 13 | 55671787777419 |
| 14 | 1496799152925925 |
| 15 | 42138629446101195 |
| 16 | 1273072014409479719 |
| 17 | 40078261700215782164 |
| 18 | 1346081462070844724125 |
| 19 | 46899893904515009262290 |