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 | 2 |
| 3 | 3 |
| 4 | 7 |
| 5 | 14 |
| 6 | 39 |
| 7 | 97 |
| 8 | 308 |
| 9 | 897 |
| 10 | 3139 |
| 11 | 10304 |
| 12 | 38997 |
| 13 | 140893 |
| 14 | 570002 |
| 15 | 2230599 |
| 16 | 9567979 |
| 17 | 40091222 |
| 18 | 181203603 |
| 19 | 805962157 |
| 20 | 3819522284 |
| 21 | 17912075229 |
| 22 | 88646095447 |
| 23 | 435959031488 |
| 24 | 2245454002137 |
| 25 | 11530035000169 |
| 26 | 61627679281154 |