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 | 10 |
| 3 | 30 |
| 4 | 112 |
| 5 | 300 |
| 6 | 840 |
| 7 | 2044 |
| 8 | 4864 |
| 9 | 10944 |
| 10 | 23960 |
| 11 | 50908 |
| 12 | 105840 |
| 13 | 215748 |
| 14 | 432656 |
| 15 | 855240 |
| 16 | 1669568 |
| 17 | 3223404 |
| 18 | 6162552 |
| 19 | 11678540 |
| 20 | 21957440 |
| 21 | 40988976 |
| 22 | 76019944 |
| 23 | 140155100 |
| 24 | 256995936 |
| 25 | 468887700 |
| 26 | 851538064 |
| 27 | 1539858168 |
| 28 | 2773522192 |
| 29 | 4977094956 |
| 30 | 8900629800 |