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 | 7 |
| 3 | 30 |
| 4 | 106 |
| 5 | 343 |
| 6 | 1065 |
| 7 | 3244 |
| 8 | 9796 |
| 9 | 29469 |
| 10 | 88507 |
| 11 | 265642 |
| 12 | 797070 |
| 13 | 2391379 |
| 14 | 7174333 |
| 15 | 21523224 |
| 16 | 64569928 |
| 17 | 193710073 |
| 18 | 581130543 |
| 19 | 1743391990 |
| 20 | 5230176370 |
| 21 | 15690529551 |
| 22 | 47071589137 |
| 23 | 141214767940 |
| 24 | 423644304396 |
| 25 | 1270932913813 |
| 26 | 3812798742115 |