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 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 14 |
| 4 | 53 |
| 5 | 208 |
| 6 | 843 |
| 7 | 3494 |
| 8 | 14769 |
| 9 | 63378 |
| 10 | 275480 |
| 11 | 1210213 |
| 12 | 5365307 |
| 13 | 23973429 |
| 14 | 107853409 |
| 15 | 488137798 |
| 16 | 2221048540 |
| 17 | 10153825751 |
| 18 | 46617145752 |
| 19 | 214844862927 |
| 20 | 993601026038 |
| 21 | 4609693262811 |
| 22 | 21448031058110 |
| 23 | 100058764135997 |