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Search: id:A105281
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| A105281 |
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a(0)=0; a(n)=6*a(n-1)+6. |
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+0
1
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| 0, 6, 42, 258, 1554, 9330, 55986, 335922, 2015538, 12093234, 72559410, 435356466, 2612138802, 15672832818, 94036996914, 564221981490, 3385331888946
(list; graph; listen)
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OFFSET
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0,2
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COMMENT
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Number of integers from 0 to (10^n)-1 that lack 0, 1, 2 and 3 as a digit.
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MAPLE
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a:=n->sum (6^j, j=1..n): seq(a(n), n=0..16); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Oct 03 2007
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PROGRAM
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(PARI) a(n)=if(n<0, 0, (6^n-1)*6/5)
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CROSSREFS
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Cf. A052386, A052379, A080674, A029858, A000918.
Sequence in context: A082139 A054613 A141834 this_sequence A158797 A074429 A062310
Adjacent sequences: A105278 A105279 A105280 this_sequence A105282 A105283 A105284
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KEYWORD
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easy,nonn
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AUTHOR
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Alexandre Wajnberg (alexandre.wajnberg(AT)ulb.ac.be), Apr 25 2005
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