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 | 7 |
| 2 | 20 |
| 3 | 148 |
| 4 | 1096 |
| 5 | 59874 |
| 6 | 442413 |
| 7 | 24154952 |
| 8 | 178482300 |
| 9 | 9744803446 |
| 10 | 3931334297144 |
| 11 | 29048849665247 |
| 12 | 11719142372802611 |
| 13 | 639843493530054949 |
| 14 | 4727839468229346561 |
| 15 | 258131288619006739623 |
| 16 | 104137594330290877971834 |
| 17 | 42012104037905142549565934 |
| 18 | 310429793570191990870734214 |