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 A125945 a(n) is the number of nonnegative integers k less than 10^n such that the decimal representation of k lacks at least one of digits 1,2, at least one of digits 3,4 and at least one of digits 5,6,7,8,9. 19
 10, 96, 892, 8076, 71500, 619236, 5241652, 43355436, 350740540, 2780210676, 21641505412, 165814383996, 1253254845580, 9362782430916, 69259450905172, 508062802935756, 3700662365318620, 26794126632247956, 193018363703408932, 1384505203965202716 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS Colin Barker, Table of n, a(n) for n = 1..1000 Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets Index entries for linear recurrences with constant coefficients, signature (28,-322,1960,-6769,13132,-13068,5040). FORMULA a(n) = 20*7^n-60*6^n+85*5^n-70*4^n+34*3^n-9*2^n+1. G.f.: -2*x*(2520*x^6 -6054*x^5 +6063*x^4 -2794*x^3 +712*x^2 -92*x +5) / ((x -1)*(2*x -1)*(3*x -1)*(4*x -1)*(5*x -1)*(6*x -1)*(7*x -1)). - Colin Barker, Feb 23 2015 MAPLE f:=n->20*7^n-60*6^n+85*5^n-70*4^n+34*3^n-9*2^n+1; PROG (PARI) a(n)=20*7^n-60*6^n+85*5^n-70*4^n+34*3^n-9*2^n+1 \\ Charles R Greathouse IV, Sep 24 2015 CROSSREFS Cf. A125630. Sequence in context: A197083 A197086 A278359 * A259497 A190986 A287831 Adjacent sequences:  A125942 A125943 A125944 * A125946 A125947 A125948 KEYWORD nonn,base,easy AUTHOR Aleksandar M. Janjic and Milan Janjic, Feb 04 2007 STATUS approved

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Last modified May 21 04:46 EDT 2022. Contains 353887 sequences. (Running on oeis4.)