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 A343043 a(n) = A343042(n, n). 2
 0, 1, 6, 9, 12, 15, 120, 127, 150, 153, 156, 159, 240, 247, 270, 273, 300, 303, 360, 367, 390, 393, 420, 423, 5040, 5065, 5166, 5193, 5172, 5199, 5880, 5911, 5910, 5913, 5916, 5919, 6000, 6031, 6030, 6033, 6060, 6063, 6120, 6151, 6150, 6153, 6180, 6183, 10080 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS This sequence has similarities with A087019 and A343047. LINKS Rémy Sigrist, Table of n, a(n) for n = 0..5039 Rémy Sigrist, PARI program for A343043 FORMULA a(k!) = (2*k-1)! for any k > 0. a(A007489(k)) = A007489(2*k-1) for any k > 0. EXAMPLE For n = 42: - the factorial base representation of 42 is "1300", so:               1 3 0 0             x 1 3 0 0             ---------               0 0 0 0             0 0 0 0           1 3 0 0       + 1 1 0 0       ---------------         1 1 3 0 0 0 0 - hence a(42) = 7! + 6! + 3*5! = 6120. PROG (PARI) See Links section. CROSSREFS Cf. A007489, A087019, A343042, A343047. Sequence in context: A297667 A315955 A315956 * A343047 A023040 A001474 Adjacent sequences:  A343040 A343041 A343042 * A343044 A343045 A343046 KEYWORD nonn,base AUTHOR Rémy Sigrist, Apr 05 2021 STATUS approved

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Last modified May 13 12:02 EDT 2021. Contains 343839 sequences. (Running on oeis4.)