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 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 16 |
| 5 | 37 |
| 6 | 129 |
| 7 | 338 |
| 8 | 753 |
| 9 | 1700 |
| 10 | 3103 |
| 11 | 11587 |
| 12 | 38262 |
| 13 | 108970 |
| 14 | 314889 |
| 15 | 1052618 |
| 16 | 3214631 |
| 17 | 7956588 |
| 18 | 21949554 |
| 19 | 99877774 |
| 20 | 222744643 |
| 21 | 597394253 |
| 22 | 1932355207 |
| 23 | 7250186215 |
| 24 | 17146907277 |
| 25 | 55160980938 |
| 26 | 155891678120 |
| 27 | 508666658005 |
| 28 | 1427745660373 |
| 29 | 4551193622463 |