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 | 5 |
| 2 | 23 |
| 3 | 101 |
| 4 | 467 |
| 5 | 2165 |
| 6 | 10055 |
| 7 | 46709 |
| 8 | 216995 |
| 9 | 1008101 |
| 10 | 4683383 |
| 11 | 21757829 |
| 12 | 101081459 |
| 13 | 469599317 |
| 14 | 2181641639 |
| 15 | 10135364501 |
| 16 | 47086382915 |
| 17 | 218751625157 |
| 18 | 1016265649367 |
| 19 | 4721317472933 |
| 20 | 21934066839827 |
| 21 | 101900219778101 |
| 22 | 473403079631879 |
| 23 | 2199312977861813 |