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 | 3 |
| 4 | 9 |
| 5 | 30 |
| 6 | 102 |
| 7 | 369 |
| 8 | 1362 |
| 9 | 5181 |
| 10 | 20064 |
| 11 | 79035 |
| 12 | 315366 |
| 13 | 1272789 |
| 14 | 5185080 |
| 15 | 21296196 |
| 16 | 88083993 |
| 17 | 366584253 |
| 18 | 1533953100 |
| 19 | 6449904138 |
| 20 | 27238006971 |
| 21 | 115475933202 |
| 22 | 491293053093 |
| 23 | 2096930378415 |
| 24 | 8976370298886 |
| 25 | 38528771056425 |
| 26 | 165784567505325 |