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 | 3 |
| 3 | 6 |
| 4 | 15 |
| 5 | 30 |
| 6 | 78 |
| 7 | 170 |
| 8 | 423 |
| 9 | 991 |
| 10 | 2410 |
| 11 | 5742 |
| 12 | 13950 |
| 13 | 33462 |
| 14 | 80954 |
| 15 | 195060 |
| 16 | 471255 |
| 17 | 1136690 |
| 18 | 2745273 |
| 19 | 6625110 |
| 20 | 15996850 |
| 21 | 38614140 |
| 22 | 93228102 |
| 23 | 225058682 |
| 24 | 543354078 |
| 25 | 1311738151 |
| 26 | 3166849426 |
| 27 | 7645371036 |
| 28 | 18457637018 |
| 29 | 44560482150 |
| 30 | 107578717860 |
| 31 | 259717522850 |
| 32 | 627014037303 |
| 33 | 1513744660692 |
| 34 | 3654504012630 |