The Encyclopedia itself has been posted here a few times, including recently:<p><a href="https://hn.algolia.com/?query=The%20On-Line%20Encyclopedia%20of%20Integer%20Sequences&sort=byDate&prefix&page=0&dateRange=all&type=story" rel="nofollow">https://hn.algolia.com/?query=The%20On-Line%20Encyclopedia%2...</a><p>(This article is not a dupe, though, obviously.)