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A037799 Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 3,2,1,0. 0
3, 32, 321, 3210, 32103, 321032, 3210321, 32103210, 321032103, 3210321032, 32103210321, 321032103210, 3210321032103, 32103210321032, 321032103210321, 3210321032103210 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

FORMULA

a(n)=10*a(n-1)+(1/2)*{(n mod 4)+[(n+1) mod 4]+[(n+2) mod 4]-[(n+3) mod 4]}, with a(0)=0 [From Paolo P. Lava (paoloplava(AT)gmail.com), Jul 30 2009]

CROSSREFS

Sequence in context: A029502 A037792 A037673 * A091706 A091705 A137215

Adjacent sequences:  A037796 A037797 A037798 * A037800 A037801 A037802

KEYWORD

nonn,base

AUTHOR

Clark Kimberling (ck6(AT)evansville.edu)

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Last modified February 15 07:58 EST 2012. Contains 205717 sequences.