Neat integer sequences

@intseq.bsky.social

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Dedicated to finding and discussing fun entries on OEIS. The successor to https://www.tumblr.com/obis. By @plutor.org

The 39 non-rectangular nonominoes that can tile a rectangle with copies of itself.
The Luoshu magic square, a 3x3 grid of numbers where the rows, columns, and diagonals all add up to 15