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 | 8 |
| 2 | 52 |
| 3 | 308 |
| 4 | 2012 |
| 5 | 13308 |
| 6 | 88582 |
| 7 | 590710 |
| 8 | 3941716 |
| 9 | 26308100 |
| 10 | 175600282 |
| 11 | 1172118538 |
| 12 | 7823866514 |
| 13 | 52224288462 |
| 14 | 348597313326 |
| 15 | 2326889050098 |
| 16 | 15531999290132 |
| 17 | 103676198275324 |
| 18 | 692039319384424 |
| 19 | 4619367120609720 |