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A125909 a(n) is the number of nonnegative integers k less than 10^n such that the decimal representation of k lacks the digit 1, at least one of the digits 2,3 and at least one of digits 4,5,6,7,8,9. 17
9, 79, 681, 5791, 48729, 405919, 3340521, 27094111, 216288249, 1699187359, 13147825161, 100334472031, 756309350169, 5639967562399, 41669245538601, 305413957523551, 2223312590034489, 16091187568891039, 115885120813664841 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..19.

Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets

FORMULA

a(n)=12*7^n-36*6^n+55*5^n-50*4^n+27*3^n-8*2^n+1.

EXAMPLE

a(8)=27094111

MAPLE

f:=n->12*7^n-36*6^n+55*5^n-50*4^n+27*3^n-8*2^n+1;

CROSSREFS

Cf. A125630.

Sequence in context: A172203 A198857 A126632 * A125421 A163445 A190979

Adjacent sequences:  A125906 A125907 A125908 * A125910 A125911 A125912

KEYWORD

nonn,base

AUTHOR

Aleksandar M. Janjic and Milan R. Janjic, (agnus(AT)blic.net), Feb 04 2007

STATUS

approved

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Last modified May 18 07:10 EDT 2013. Contains 225419 sequences.