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A093137 Expansion of (1-7x)/((1-x)(1-10x)). 3
1, 4, 34, 334, 3334, 33334, 333334, 3333334, 33333334, 333333334, 3333333334, 33333333334, 333333333334, 3333333333334, 33333333333334, 333333333333334, 3333333333333334, 33333333333333334, 333333333333333334 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

Second binomial transform of 3*A001045(3n)/3+(-1)^n. Partial sums of A093138. A convex combination of 10^n and 1. In general the second binomial transform of k*Jacobsthal(3n)/3+(-1)^n is 1,1+k,1+11k,1+111k,... This is the case for k=3.

FORMULA

a(n)=3*10^n/9+6/9

a(n)=10*a(n-1)-6 with a(0)=1 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 02 2010]

EXAMPLE

a(1)=10*1-6=4; a(2)=10*4-6=34; a(3)=10*34-6=334 [From Vincenzo Librandi (vincenzo.librandi(AT)tin.it), Aug 02 2010]

a(1)^2=16

a(2)^2=1156

a(3)^2=111556

a(4)^2=11115556

a(5)^2=1111155556

a(6)^2=111111555556

a(7)^2=11111115555556

a(8)^2=1111111155555556

a(9)^2=111111111555555556,etc... [From DELEHAM Philippe, Oct 03 2011]

CROSSREFS

Sequence in context: A036352 A005569 A025572 * A107350 A206180 A199752

Adjacent sequences:  A093134 A093135 A093136 * A093138 A093139 A093140

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Mar 24 2004

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Last modified February 16 05:55 EST 2012. Contains 205860 sequences.