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A213880 a(n) = sum of n-digit numbers with distinct nonzero digits. 0
45, 3960, 279720, 16798320, 839991600, 33599966400, 1007999899200, 20159999798400, 201599999798400 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

H. E. Dudeney, Amusements in Mathematics, Dover, NY, 1917, pp. 17, 160.

LINKS

Table of n, a(n) for n=1..9.

H. E. Dudeney, Amusements in Mathematics [Gutenberg Project Etext]

FORMULA

a(n) = 5*(10^n - 1)*8!/(9 - n)!.

MATHEMATICA

Table[5*(10^n - 1)*8!/(9 - n)!, {n, 9}]

PROG

(MAGMA) [ 5*(10^n-1)*Factorial(8)/Factorial(9-n) : n in [1..9]]

(PARI) vector(9, n, 5*(10^n-1)*8!/(9-n)!)

CROSSREFS

Sequence in context: A184286 A130017 A025755 * A113630 A143004 A004707

Adjacent sequences:  A213877 A213878 A213879 * A213881 A213882 A213883

KEYWORD

base,easy,fini,full,nonn

AUTHOR

Arkadiusz Wesolowski, Jun 23 2012

STATUS

approved

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Last modified January 27 06:18 EST 2022. Contains 350601 sequences. (Running on oeis4.)