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 | 0 |
| 1 | 1 |
| 2 | 4 |
| 3 | 13 |
| 4 | 39 |
| 5 | 112 |
| 6 | 313 |
| 7 | 859 |
| 8 | 2328 |
| 9 | 6253 |
| 10 | 16687 |
| 11 | 44320 |
| 12 | 117297 |
| 13 | 309619 |
| 14 | 815656 |
| 15 | 2145541 |
| 16 | 5637351 |
| 17 | 14799280 |
| 18 | 38826025 |
| 19 | 101809867 |
| 20 | 266865720 |
| 21 | 699311581 |
| 22 | 1832117599 |
| 23 | 4799138368 |
| 24 | 12569491809 |
| 25 | 32917725667 |
| 26 | 86200462408 |
| 27 | 225717215989 |
| 28 | 591018294423 |
| 29 | 1547471885008 |