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 | 1 |
| 3 | 1 |
| 4 | 2 |
| 5 | 3 |
| 6 | 6 |
| 7 | 14 |
| 8 | 30 |
| 9 | 76 |
| 10 | 170 |
| 11 | 553 |
| 12 | 1583 |
| 13 | 5106 |
| 14 | 14090 |
| 15 | 41002 |
| 16 | 164769 |
| 17 | 603513 |
| 18 | 2418348 |
| 19 | 8335804 |
| 20 | 28704417 |
| 21 | 109618261 |
| 22 | 466318442 |
| 23 | 2114095511 |
| 24 | 10276979159 |
| 25 | 43213859606 |
| 26 | 175668903294 |
| 27 | 793946150358 |
| 28 | 3490939879402 |
| 29 | 15500974371599 |
| 30 | 82490059523125 |