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 | 30 |
| 3 | 210 |
| 4 | 867 |
| 5 | 2690 |
| 6 | 6956 |
| 7 | 15833 |
| 8 | 32775 |
| 9 | 63024 |
| 10 | 114235 |
| 11 | 197241 |
| 12 | 326976 |
| 13 | 523575 |
| 14 | 813671 |
| 15 | 1231910 |
| 16 | 1822706 |
| 17 | 2642259 |
| 18 | 3760860 |
| 19 | 5265508 |
| 20 | 7262865 |
| 21 | 9882576 |
| 22 | 13280982 |
| 23 | 17645255 |
| 24 | 23197985 |
| 25 | 30202250 |
| 26 | 38967201 |
| 27 | 49854195 |
| 28 | 63283510 |
| 29 | 79741677 |
| 30 | 99789465 |
| 31 | 124070556 |