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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 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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