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 | 4 |
| 1 | 10 |
| 2 | 40 |
| 3 | 130 |
| 4 | 340 |
| 5 | 754 |
| 6 | 1480 |
| 7 | 2650 |
| 8 | 4420 |
| 9 | 6970 |
| 10 | 10504 |
| 11 | 15250 |
| 12 | 21460 |
| 13 | 29410 |
| 14 | 39400 |
| 15 | 51754 |
| 16 | 66820 |
| 17 | 84970 |
| 18 | 106600 |
| 19 | 132130 |
| 20 | 162004 |
| 21 | 196690 |
| 22 | 236680 |
| 23 | 282490 |
| 24 | 334660 |
| 25 | 393754 |
| 26 | 460360 |
| 27 | 535090 |
| 28 | 618580 |
| 29 | 711490 |
| 30 | 814504 |
| 31 | 928330 |
| 32 | 1053700 |
| 33 | 1191370 |