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 | 5 |
| 2 | 29 |
| 3 | 103 |
| 4 | 887 |
| 5 | 1517 |
| 6 | 18239 |
| 7 | 63253 |
| 8 | 332839 |
| 9 | 118127 |
| 10 | 2331085 |
| 11 | 4222975 |
| 12 | 100309579 |
| 13 | 184649263 |
| 14 | 1710440723 |
| 15 | 6372905521 |
| 16 | 202804884977 |
| 17 | 381240382217 |
| 18 | 13667257415003 |
| 19 | 25872280345103 |
| 20 | 49119954154463 |
| 21 | 93501887462903 |