A000308 - OEIS

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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.

1, 2, 3, 6, 36, 648, 139968, 3265173504, 296148833645101056, 135345882205792807436868315512832, 130876399105969522361889021452224949874232743897657526714368 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	FORMULA	`a(n) =2^A001590(n-2)*3^A000073(n-1). - Henry Bottomley (se16(AT)btinternet.com), Jul 16 2001`
	EXAMPLE	`a(6)=3663=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, A063401.` `Sequence in context: A018324 A178175 A129379 * A173501 A018340 A184716` `Adjacent sequences: A000305 A000306 A000307 * A000309 A000310 A000311`
	KEYWORD	`nonn`
	AUTHOR	`N. J. A. Sloane (njas(AT)research.att.com).`

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Last modified February 14 15:19 EST 2012. Contains 205623 sequences.