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 A058524 Each c(i) is "multiply" (*) or "divide" (/). a(n) is number of choices for c(1), ..., c(n-1) so that 1 c(1) 2 c(2) 3,.., c(n-1) n is an integer. 3
 1, 1, 1, 2, 2, 8, 8, 13, 21, 77, 77, 128, 128, 354, 641, 1232, 1232, 2677, 2677, 7220, 8951, 25378, 25378, 63680, 113335, 323151, 532358, 1442702, 1442702, 2963955, 2963955, 5307221, 6739508, 21786788, 41416560, 83691901, 83691901, 242224403, 373640477, 669300795, 669300795 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 LINKS Sean A. Irvine, Java program (github) FORMULA a(p) = a(p-1). - Sean A. Irvine, Aug 07 2022 EXAMPLE For n = 4 there are 2 possibilities: 1*2*3*4=24 and 1/2*3*4=6. For n = 9 there are 13 possibilities: 1*2*3*4*5*6*7*8 1/2*3*4*5*6*7*8 1/2/3*4*5*6*7*8 1*2/3*4*5*6*7*8 1*2*3*4*5/6*7*8 1*2*3/4*5*6*7*8 1*2/3/4*5*6*7*8 1/2*3*4*5/6*7*8 1/2*3/4*5*6*7*8 1/2/3/4*5*6*7*8 1*2*3*4*5*6*7/8 1*2/3*4*5*6*7/8 1*2*3/4*5/6*7*8. CROSSREFS Sequence in context: A346205 A343984 A268342 * A072576 A271342 A060818 Adjacent sequences: A058521 A058522 A058523 * A058525 A058526 A058527 KEYWORD nonn,nice AUTHOR Naohiro Nomoto, Dec 22 2000 EXTENSIONS More terms from Sascha Kurz, Oct 14 2001 a(31)-a(41) from Sean A. Irvine, Aug 07 2022 STATUS approved

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Last modified December 4 13:24 EST 2022. Contains 358558 sequences. (Running on oeis4.)