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 | 11 |
| 2 | 42 |
| 3 | 155 |
| 4 | 574 |
| 5 | 2142 |
| 6 | 8052 |
| 7 | 30459 |
| 8 | 115830 |
| 9 | 442442 |
| 10 | 1696396 |
| 11 | 6525246 |
| 12 | 25169452 |
| 13 | 97319900 |
| 14 | 377096040 |
| 15 | 1463921595 |
| 16 | 5692584870 |
| 17 | 22169259090 |
| 18 | 86452604700 |
| 19 | 337547269290 |
| 20 | 1319388204420 |
| 21 | 5162382341220 |
| 22 | 20217646564440 |
| 23 | 79246770753150 |
| 24 | 310866899505084 |