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 | 1 |
| 2 | 5 |
| 3 | 29 |
| 4 | 274 |
| 5 | 3160 |
| 6 | 47452 |
| 7 | 825862 |
| 8 | 16843268 |
| 9 | 387702833 |
| 10 | 10009826727 |
| 11 | 285360679985 |
| 12 | 8918294547447 |
| 13 | 302888236005847 |
| 14 | 11112685321898449 |
| 15 | 437898668488710801 |
| 16 | 18447025705612363530 |
| 17 | 827242514466399305122 |
| 18 | 39346558271561286347116 |
| 19 | 1978421007121668206129316 |