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 | 2 |
| 1 | 3 |
| 2 | 12 |
| 3 | 24 |
| 4 | 119 |
| 5 | 341 |
| 6 | 1219 |
| 7 | 4361 |
| 8 | 16467 |
| 9 | 57641 |
| 10 | 208987 |
| 11 | 780915 |
| 12 | 2838550 |
| 13 | 10676000 |
| 14 | 39472122 |
| 15 | 148231324 |
| 16 | 559305605 |
| 17 | 2106222351 |
| 18 | 7995067942 |
| 19 | 30299372141 |
| 20 | 115430379568 |
| 21 | 440354051430 |
| 22 | 1683364991290 |
| 23 | 6448757014608 |
| 24 | 24754017328490 |
| 25 | 95132828618112 |
| 26 | 366232755206338 |