A068587 - OEIS

A068587

Multiplicative 3-wave sequence starting with 1,2,3.

1, 2, 3, 6, 6, 36, 108, 3888, 23328, 90699264, 9795520512, 888446500935303168, 20725679973818752303104, 18413657852244156256526524022900467433472, 180371363192607497842938699938382286478962971377664

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OFFSET

0,2

LINKS

Table of n, a(n) for n=0..14.

FORMULA

a(n)=a(n-1)*a(n-2) if n is odd, a(n)=a(n-1)*a(n-4) if n is even.

MAPLE

For given n, this generates terms with index 0 through 2n: a[0] := 1; a[1] := 2; a[2] := 3; for i from 1 to n-1 do a[2*i+1] := a[2*i]*a[2*i-1]; a[2*i+2] := a[2*i+1]*a[2*i-2]; od; # Christopher N. Swanson (cswanson(AT)ashland.edu), Jul 22 2003

CROSSREFS

Cf. A038196.

Sequence in context: A015628 A060692 A015698 * A218954 A182560 A298750

Adjacent sequences: A068584 A068585 A068586 * A068588 A068589 A068590

KEYWORD

nonn,easy

AUTHOR

Floor van Lamoen, Mar 21 2002

EXTENSIONS

More terms from Christopher N. Swanson (cswanson(AT)ashland.edu), Jul 22 2003

STATUS

approved