3 lines
152 B
Text
3 lines
152 B
Text
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BellTriangle[n_Integer?Positive] := NestList[Accumulate[# /. {a___, b_} :> {b, a, b}] &, {1}, n - 1];
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BellNumber[n_Integer] := BellTriangle[n][[n, 1]];
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