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) |
|---|---|
| 2 | 0 |
| 3 | 3 |
| 4 | 62 |
| 5 | 683 |
| 6 | 4015 |
| 7 | 16989 |
| 8 | 56196 |
| 9 | 158271 |
| 10 | 391917 |
| 11 | 882683 |
| 12 | 1836106 |
| 13 | 3587103 |
| 14 | 6638267 |
| 15 | 11747613 |
| 16 | 19985680 |
| 17 | 32879339 |
| 18 | 52490521 |
| 19 | 81638211 |
| 20 | 124000342 |
| 21 | 184440963 |
| 22 | 269135111 |
| 23 | 386033453 |
| 24 | 545007772 |
| 25 | 758491143 |
| 26 | 1041639045 |
| 27 | 1413189339 |
| 28 | 1895630946 |
| 29 | 2516334551 |
| 30 | 3307717267 |