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 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 27 |
| 5 | 167 |
| 6 | 923 |
| 7 | 5543 |
| 8 | 32999 |
| 9 | 200309 |
| 10 | 1221329 |
| 11 | 7503033 |
| 12 | 46301793 |
| 13 | 286971677 |
| 14 | 1784658077 |
| 15 | 11131825877 |
| 16 | 69611130917 |
| 17 | 436270168817 |
| 18 | 2739539507957 |
| 19 | 17232530582057 |
| 20 | 108564692241257 |
| 21 | 684901029237677 |
| 22 | 4326215549824277 |
| 23 | 27357682806703397 |