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 A000308 a(n)=a(n-1)*a(n-2)*a(n-3) with a(1)=1, a(2)=2 and a(3)=3. 4
 1, 2, 3, 6, 36, 648, 139968, 3265173504, 296148833645101056, 135345882205792807436868315512832, 130876399105969522361889021452224949874232743897657526714368 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS John Cerkan, Table of n, a(n) for n = 1..15 FORMULA a(n) =2^A001590(n-1)*3^A000073(n-1). - Henry Bottomley, Jul 16 2001 EXAMPLE a(6)=36*6*3=648. MAPLE A000308 := proc(n) option remember; if n <=3 then n else A000308(n-1)*A000308(n-2)*A000308(n-3); fi; end; CROSSREFS Cf. A000304, A000336, A063401. Sequence in context: A263803 A178175 A129379 * A299399 A173501 A018340 Adjacent sequences:  A000305 A000306 A000307 * A000309 A000310 A000311 KEYWORD nonn AUTHOR STATUS approved

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Last modified February 18 15:30 EST 2020. Contains 332019 sequences. (Running on oeis4.)