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 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 16 |
| 4 | 63 |
| 5 | 262 |
| 6 | 1105 |
| 7 | 4676 |
| 8 | 19803 |
| 9 | 83882 |
| 10 | 355325 |
| 11 | 1505176 |
| 12 | 6376023 |
| 13 | 27009262 |
| 14 | 114413065 |
| 15 | 484661516 |
| 16 | 2053059123 |
| 17 | 8696898002 |
| 18 | 36840651125 |
| 19 | 156059502496 |
| 20 | 661078661103 |
| 21 | 2800374146902 |
| 22 | 11862575248705 |
| 23 | 50250675141716 |
| 24 | 212865275815563 |
| 25 | 901711778403962 |