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 | 148 |
| 2 | 4102 |
| 3 | 52591 |
| 4 | 422488 |
| 5 | 2469182 |
| 6 | 11444292 |
| 7 | 44435746 |
| 8 | 150015321 |
| 9 | 452158538 |
| 10 | 1240740774 |
| 11 | 3145970477 |
| 12 | 7456438392 |
| 13 | 16672410340 |
| 14 | 35430409240 |
| 15 | 71995370532 |
| 16 | 140596619273 |
| 17 | 264988109400 |
| 18 | 483746928198 |
| 19 | 857992826459 |
| 20 | 1482422036736 |