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) |
|---|---|
| 0 | 3 |
| 1 | 14 |
| 2 | 61 |
| 3 | 260 |
| 4 | 1103 |
| 5 | 4674 |
| 6 | 19801 |
| 7 | 83880 |
| 8 | 355323 |
| 9 | 1505174 |
| 10 | 6376021 |
| 11 | 27009260 |
| 12 | 114413063 |
| 13 | 484661514 |
| 14 | 2053059121 |
| 15 | 8696898000 |
| 16 | 36840651123 |
| 17 | 156059502494 |
| 18 | 661078661101 |
| 19 | 2800374146900 |
| 20 | 11862575248703 |
| 21 | 50250675141714 |
| 22 | 212865275815561 |
| 23 | 901711778403960 |
| 24 | 3819712389431403 |