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 | 3 |
| 2 | 5 |
| 3 | 10 |
| 4 | 25 |
| 5 | 64 |
| 6 | 160 |
| 7 | 390 |
| 8 | 940 |
| 9 | 2270 |
| 10 | 5515 |
| 11 | 13440 |
| 12 | 32735 |
| 13 | 79610 |
| 14 | 193480 |
| 15 | 470306 |
| 16 | 1143585 |
| 17 | 2781070 |
| 18 | 6762990 |
| 19 | 16445100 |
| 20 | 39987325 |
| 21 | 97232450 |
| 22 | 236432060 |
| 23 | 574915770 |
| 24 | 1397981470 |
| 25 | 3399360474 |
| 26 | 8265943685 |
| 27 | 20099618590 |
| 28 | 48874630750 |