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 | 1 |
| 2 | 0 |
| 3 | 1 |
| 4 | 1 |
| 5 | 2 |
| 6 | 3 |
| 7 | 7 |
| 8 | 12 |
| 9 | 27 |
| 10 | 55 |
| 11 | 127 |
| 12 | 284 |
| 13 | 682 |
| 14 | 1618 |
| 15 | 3979 |
| 16 | 9823 |
| 17 | 24722 |
| 18 | 62651 |
| 19 | 160744 |
| 20 | 415146 |
| 21 | 1081107 |
| 22 | 2831730 |
| 23 | 7462542 |
| 24 | 19764010 |
| 25 | 52599053 |
| 26 | 140580206 |
| 27 | 377244482 |
| 28 | 1016022191 |
| 29 | 2745783463 |
| 30 | 7443742141 |
| 31 | 20239038700 |
| 32 | 55178647926 |
| 33 | 150820588425 |
| 34 | 413226000775 |