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A037750
Decimal expansion of a(n) is given by the first n terms of the periodic sequence with initial period 2,3,0,1.
0
2, 23, 230, 2301, 23012, 230123, 2301230, 23012301, 230123012, 2301230123, 23012301230, 230123012301, 2301230123012, 23012301230123, 230123012301230, 2301230123012301
OFFSET
1,1
FORMULA
G.f.: ( 2+3*x+x^3 )*x / ( (x-1)*(10*x-1)*(1+x)*(1+x^2) ). - R. J. Mathar, Nov 21 2011
PROG
(PARI) Vec((2+3*x+x^3 )*x/((x-1)*(10*x-1)*(1+x)*(1+x^2)) + O(x^25)) \\ Jinyuan Wang, Apr 14 2020
CROSSREFS
Sequence in context: A036937 A083808 A252016 * A037631 A026075 A037757
KEYWORD
nonn,base,easy
STATUS
approved