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 | 0 |
| 2 | 1 |
| 3 | 17 |
| 4 | 105 |
| 5 | 410 |
| 6 | 1225 |
| 7 | 3066 |
| 8 | 6762 |
| 9 | 13560 |
| 10 | 25245 |
| 11 | 44275 |
| 12 | 73931 |
| 13 | 118482 |
| 14 | 183365 |
| 15 | 275380 |
| 16 | 402900 |
| 17 | 576096 |
| 18 | 807177 |
| 19 | 1110645 |
| 20 | 1503565 |
| 21 | 2005850 |
| 22 | 2640561 |
| 23 | 3434222 |
| 24 | 4417150 |
| 25 | 5623800 |
| 26 | 7093125 |
| 27 | 8868951 |
| 28 | 11000367 |
| 29 | 13542130 |
| 30 | 16555085 |
| 31 | 20106600 |