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 | 2 |
| 2 | 6 |
| 3 | 14 |
| 4 | 122 |
| 5 | 362 |
| 6 | 5282 |
| 7 | 20582 |
| 8 | 397154 |
| 9 | 2027090 |
| 10 | 46177922 |
| 11 | 303147902 |
| 12 | 7699478162 |
| 13 | 63517159994 |
| 14 | 1745540360930 |
| 15 | 17676592058582 |
| 16 | 517137940132802 |
| 17 | 6290714838241442 |
| 18 | 194139271606482434 |
| 19 | 2782486941099788270 |
| 20 | 90105513853333901042 |
| 21 | 1495993248737211995402 |
| 22 | 50671468195931300884322 |