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 | 0 |
| 2 | 4 |
| 3 | 14 |
| 4 | 58 |
| 5 | 229 |
| 6 | 749 |
| 7 | 2180 |
| 8 | 6188 |
| 9 | 17912 |
| 10 | 52620 |
| 11 | 154383 |
| 12 | 450195 |
| 13 | 1309452 |
| 14 | 3811888 |
| 15 | 11110432 |
| 16 | 32392550 |
| 17 | 94412963 |
| 18 | 275116777 |
| 19 | 801676752 |
| 20 | 2336222946 |
| 21 | 6808405238 |
| 22 | 19841419978 |
| 23 | 57821971765 |
| 24 | 168504312515 |
| 25 | 491055599116 |
| 26 | 1431039769316 |
| 27 | 4170353383134 |
| 28 | 12153282490316 |
| 29 | 35417189532323 |