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 | 3 |
| 3 | 23 |
| 4 | 61 |
| 5 | 421 |
| 6 | 1103 |
| 7 | 7563 |
| 8 | 19801 |
| 9 | 135721 |
| 10 | 355323 |
| 11 | 2435423 |
| 12 | 6376021 |
| 13 | 43701901 |
| 14 | 114413063 |
| 15 | 784198803 |
| 16 | 2053059121 |
| 17 | 14071876561 |
| 18 | 36840651123 |
| 19 | 252509579303 |
| 20 | 661078661101 |
| 21 | 4531100550901 |
| 22 | 11862575248703 |
| 23 | 81307300336923 |
| 24 | 212865275815561 |
| 25 | 1459000305513721 |