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A290650
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a(1) = 1. For n > 1, a(n) = a(n-1)/2 if a(n-1) is even, a(n) = a(n-1)*n otherwise.
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1
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1, 2, 1, 4, 2, 1, 7, 56, 28, 14, 7, 84, 42, 21, 315, 5040, 2520, 1260, 630, 315, 6615, 145530, 72765, 1746360, 873180, 436590, 218295, 6112260, 3056130, 1528065, 47370015, 1515840480, 757920240, 378960120
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OFFSET
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1,2
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COMMENTS
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LINKS
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MATHEMATICA
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nxt[{n_, a_}]:={n+1, If[EvenQ[a], a/2, a(n+1)]}; NestList[nxt, {1, 1}, 40][[All, 2]] (* Harvey P. Dale, Dec 23 2020 *)
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PROG
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(PARI) terms(n) = my(x=1, k=1, i=0); while(1, if(i==n, break, if(i==0, print1(x, ", "); k++; i++, if(x%2==0, x=x/2; k++, x=x*k; k++); print1(x, ", "); i++)))
/* Print initial 40 terms as follows */
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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