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 | 2 |
| 5 | 6 |
| 6 | 21 |
| 7 | 112 |
| 8 | 853 |
| 9 | 11117 |
| 10 | 261080 |
| 11 | 11716571 |
| 12 | 1006700565 |
| 13 | 164159 |
| 14 | 422662 |
| 15 | 1295037 |
| 16 | 4272969 |
| 17 | 12780650 |
| 18 | 23303620 |
| 19 | 64379033 |
| 20 | 189490870 |
| 21 | 556338383 |
| 22 | 1448500351 |
| 23 | 2871171041 |
| 24 | 7624849834 |
| 25 | 20914847051 |
| 26 | 55714746424 |
| 27 | 133364472272 |
| 28 | 277569288280 |
| 29 | 708402263349 |
| 30 | 1827946074290 |
| 31 | 4530654263579 |
| 32 | 10312511072061 |
| 33 | 22005420425661 |
| 34 | 54057174050076 |
| 35 | 132409684714581 |