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 | 0 |
| 2 | 7 |
| 3 | 7 |
| 4 | 56 |
| 5 | 105 |
| 6 | 497 |
| 7 | 1232 |
| 8 | 4711 |
| 9 | 13335 |
| 10 | 46312 |
| 11 | 139657 |
| 12 | 463841 |
| 13 | 1441440 |
| 14 | 4688327 |
| 15 | 14778407 |
| 16 | 47596696 |
| 17 | 151045545 |
| 18 | 484222417 |
| 19 | 1541541232 |
| 20 | 4931098151 |
| 21 | 15721886775 |
| 22 | 50239573832 |
| 23 | 160292781257 |
| 24 | 511969798081 |
| 25 | 1634019266880 |
| 26 | 5217807853447 |
| 27 | 16655942721607 |
| 28 | 53180597695736 |
| 29 | 169772196746985 |