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 A179215 Product of squarefree numbers less than n+1. 9
 1, 1, 2, 6, 6, 30, 180, 1260, 1260, 1260, 12600, 138600, 138600, 1801800, 25225200, 378378000, 378378000, 6432426000, 6432426000, 122216094000, 122216094000, 2566537974000, 56463835428000, 1298668214844000, 1298668214844000, 1298668214844000, 33765373585944000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 LINKS G. C. Greubel, Table of n, a(n) for n = 0..680 FORMULA a(n) = Product_{k=1..n} k^A008966(k). A001221(a(n)) = A000720(n). Subsequence of A025487. A034386(n) <= a(n) <= A000142(n). A179214(n) = a(2*n)/a(n-1) for n>0. MAPLE a:= proc(n) option remember; `if`(n=0, 1,       a(n-1)*`if`(issqrfree(n), n, 1))     end: seq(a(n), n=0..27);  # Alois P. Heinz, Sep 20 2021 MATHEMATICA With[{sfnos=Select[Range[50], SquareFreeQ]}, Table[Times@@Select[sfnos, #

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Last modified May 28 15:04 EDT 2022. Contains 354115 sequences. (Running on oeis4.)