A116986 When convolved with itself and doubled, gives the sequence A000609.
1, 1, 3, 23, 443, 23131, 3732309, 2090705825, 4388282355347
Offset: 0
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.
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