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 | 13 |
| 2 | 85 |
| 3 | 385 |
| 4 | 1375 |
| 5 | 4147 |
| 6 | 11011 |
| 7 | 26455 |
| 8 | 58630 |
| 9 | 121550 |
| 10 | 238238 |
| 11 | 445094 |
| 12 | 797810 |
| 13 | 1379210 |
| 14 | 2309450 |
| 15 | 3759074 |
| 16 | 5965487 |
| 17 | 9253475 |
| 18 | 14060475 |
| 19 | 20967375 |
| 20 | 30735705 |
| 21 | 44352165 |
| 22 | 63081525 |
| 23 | 88529025 |
| 24 | 122713500 |
| 25 | 168152556 |
| 26 | 227961228 |
| 27 | 305965660 |
| 28 | 406833460 |
| 29 | 536222500 |
| 30 | 700950052 |