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 | 10267951 |
| 2 | 72108421 |
| 3 | 111291181 |
| 4 | 139952671 |
| 5 | 1588247851 |
| 6 | 6004532941 |
| 7 | 7200256261 |
| 8 | 8815102297 |
| 9 | 9001235881 |
| 10 | 10884042841 |
| 11 | 15989367241 |
| 12 | 18500666251 |
| 13 | 23729234761 |
| 14 | 34268731321 |
| 15 | 34558584607 |
| 16 | 37870128451 |
| 17 | 74689102411 |
| 18 | 77538554731 |
| 19 | 121254376891 |
| 20 | 149842746691 |
| 21 | 187054437571 |