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A037617 Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 1,3,2. 0
1, 13, 132, 1321, 13213, 132132, 1321321, 13213213, 132132132, 1321321321, 13213213213, 132132132132, 1321321321321, 13213213213213, 132132132132132, 1321321321321321 (list; graph; refs; listen; history; internal format)
OFFSET

1,2

FORMULA

a(n)=10*a(n-1)+{(n mod 3)+[(n+2) mod 3]}, with a(0)=0 [From Paolo P. Lava (paoloplava(AT)gmail.com), Jul 30 2009]

CROSSREFS

Sequence in context: A048554 A161498 A037715 * A199144 A198664 A081042

Adjacent sequences:  A037614 A037615 A037616 * A037618 A037619 A037620

KEYWORD

nonn,base

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified February 16 21:30 EST 2012. Contains 205971 sequences.