A103527 a(0) = 2; a(n+1) = 2^a(n) + a(n).
2, 6, 70, 1180591620717411303494
Offset: 0
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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.