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A126635
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a(n) is the number of nonnegative integers k less than 10^n such that the decimal representation of k lacks the digits 1,2,3, at least one of digits 4,5 and at least one of digits 6,7,8,9.
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1
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7, 47, 307, 1943, 11827, 69287, 392707, 2166743, 11703187, 62168327, 325983907, 1692105143, 8714154547, 44600020967, 227161443907, 1152585909143, 5830444893907, 29423488811207, 148206112628707, 745396075770743
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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LINKS
| Milan Janjic, Enumerative Formulas for Some Functions on Finite Sets
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FORMULA
| a(n)=8*5^n-16*4^n+14*3^n-6*2^n+1
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EXAMPLE
| a(8)=2166743
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MAPLE
| f:=n->8*5^n-16*4^n+14*3^n-6*2^n+1;
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CROSSREFS
| Cf. A125630, A125948, A125947, A125946, A125945, A125910, A125909, A125908, A125880, A125897, A125904, A125858.
Sequence in context: A009260 A201871 A198845 * A085352 A125370 A163346
Adjacent sequences: A126632 A126633 A126634 * A126636 A126637 A126638
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KEYWORD
| nonn,base
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AUTHOR
| Aleksandar M. Janjic and Milan R. Janjic (agnus(AT)blic.net), Feb 08 2007
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