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) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 16 |
| 4 | 47 |
| 5 | 130 |
| 6 | 357 |
| 7 | 973 |
| 8 | 2647 |
| 9 | 7197 |
| 10 | 19564 |
| 11 | 53181 |
| 12 | 144561 |
| 13 | 392958 |
| 14 | 1068172 |
| 15 | 2903593 |
| 16 | 7892784 |
| 17 | 21454811 |
| 18 | 58320223 |
| 19 | 158530804 |
| 20 | 430931404 |
| 21 | 1171393005 |
| 22 | 3184176320 |
| 23 | 8655488630 |
| 24 | 23528057461 |
| 25 | 63955891057 |
| 26 | 173850136486 |
| 27 | 472573666887 |
| 28 | 1284588411309 |