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 | 7 |
| 2 | 26 |
| 3 | 95 |
| 4 | 350 |
| 5 | 1302 |
| 6 | 4884 |
| 7 | 18447 |
| 8 | 70070 |
| 9 | 267410 |
| 10 | 1024556 |
| 11 | 3938662 |
| 12 | 15184876 |
| 13 | 58689100 |
| 14 | 227327400 |
| 15 | 882230895 |
| 16 | 3429693990 |
| 17 | 13353413370 |
| 18 | 52062618300 |
| 19 | 203235266850 |
| 20 | 794258570820 |
| 21 | 3107215911540 |
| 22 | 12167180964120 |
| 23 | 47685286297350 |
| 24 | 187036101361980 |
| 25 | 734153906619252 |
| 26 | 2883674432327864 |
| 27 | 11333968799308652 |