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 | 1 |
| 3 | 3 |
| 4 | 4523 |
| 5 | 11991 |
| 6 | 18197 |
| 7 | 141683 |
| 8 | 1092489 |
| 9 | 3168099 |
| 10 | 6435309 |
| 11 | 12489657 |
| 12 | 17906499 |
| 13 | 68301841 |
| 14 | 295742437 |
| 15 | 390117873 |
| 16 | 542959199 |
| 17 | 4770504939 |
| 18 | 17360493407 |
| 19 | 73798050723 |
| 20 | 101657343993 |
| 21 | 107137400475 |
| 22 | 202491428745 |
| 23 | 1615452642807 |
| 24 | 4902182461643 |
| 25 | 9274278357017 |
| 26 | 12863364360297 |