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 | 4 |
| 4 | 11 |
| 5 | 40 |
| 6 | 147 |
| 7 | 568 |
| 8 | 2227 |
| 9 | 8824 |
| 10 | 35123 |
| 11 | 140152 |
| 12 | 559923 |
| 13 | 2238328 |
| 14 | 8950579 |
| 15 | 35796856 |
| 16 | 143176499 |
| 17 | 572684152 |
| 18 | 2290692915 |
| 19 | 9162684280 |
| 20 | 36650562355 |
| 21 | 146601899896 |
| 22 | 586406900531 |
| 23 | 2345626204024 |
| 24 | 9382502019891 |
| 25 | 37530002487160 |