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 | 1 |
| 1 | 3 |
| 2 | 9 |
| 3 | 21 |
| 4 | 60 |
| 5 | 135 |
| 6 | 282 |
| 7 | 537 |
| 8 | 945 |
| 9 | 1561 |
| 10 | 2451 |
| 11 | 3693 |
| 12 | 5378 |
| 13 | 7611 |
| 14 | 10512 |
| 15 | 14217 |
| 16 | 18879 |
| 17 | 24669 |
| 18 | 31777 |
| 19 | 40413 |
| 20 | 50808 |
| 21 | 63215 |
| 22 | 77910 |
| 23 | 95193 |
| 24 | 115389 |
| 25 | 138849 |
| 26 | 165951 |
| 27 | 197101 |
| 28 | 232734 |
| 29 | 273315 |
| 30 | 319340 |
| 31 | 371337 |
| 32 | 429867 |
| 33 | 495525 |
| 34 | 568941 |
| 35 | 650781 |
| 36 | 741748 |