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 | 1 |
| 1 | 6 |
| 2 | 27 |
| 3 | 98 |
| 4 | 315 |
| 5 | 918 |
| 6 | 2492 |
| 7 | 6372 |
| 8 | 15525 |
| 9 | 36280 |
| 10 | 81816 |
| 11 | 178794 |
| 12 | 380051 |
| 13 | 788004 |
| 14 | 1597725 |
| 15 | 3174210 |
| 16 | 6190182 |
| 17 | 11867310 |
| 18 | 22395359 |
| 19 | 41650050 |
| 20 | 76413078 |
| 21 | 138421358 |
| 22 | 247783113 |
| 23 | 438616728 |
| 24 | 768291650 |
| 25 | 1332444330 |
| 26 | 2289213495 |
| 27 | 3898064226 |
| 28 | 6581591157 |
| 29 | 11023247880 |