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 | 1 |
| 4 | 1 |
| 5 | 3 |
| 6 | 9 |
| 7 | 19 |
| 8 | 79 |
| 9 | 225 |
| 10 | 693 |
| 11 | 1901 |
| 12 | 5597 |
| 13 | 17641 |
| 14 | 57503 |
| 15 | 195431 |
| 16 | 647139 |
| 17 | 2182987 |
| 18 | 7344451 |
| 19 | 25057681 |
| 20 | 85742999 |
| 21 | 295284367 |
| 22 | 1028155825 |
| 23 | 3596134963 |
| 24 | 12659796475 |
| 25 | 44696280143 |
| 26 | 158226554179 |
| 27 | 562623263251 |
| 28 | 2006471222195 |
| 29 | 7182910999719 |
| 30 | 25795458946677 |
| 31 | 92875047372825 |
| 32 | 335362896810137 |