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 | 3 |
| 1 | 31 |
| 2 | 155 |
| 3 | 546 |
| 4 | 1554 |
| 5 | 3823 |
| 6 | 8451 |
| 7 | 17205 |
| 8 | 32802 |
| 9 | 59268 |
| 10 | 102388 |
| 11 | 170261 |
| 12 | 273975 |
| 13 | 428418 |
| 14 | 653242 |
| 15 | 973998 |
| 16 | 1423461 |
| 17 | 2043165 |
| 18 | 2885169 |
| 19 | 4014076 |
| 20 | 5509328 |
| 21 | 7467801 |
| 22 | 10006725 |
| 23 | 13266955 |
| 24 | 17416620 |
| 25 | 22655178 |
| 26 | 29217906 |