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Search: id:A146086
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| A146086 |
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Number of n-digit numbers with each digit odd where the digits 1 and 3 occur an even number of times. |
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+0
1
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| 3, 11, 45, 197, 903, 4271, 20625, 100937, 498123, 2470931, 12295605, 61300877, 305972943, 1528270391, 7636568985, 38168496017, 190799433363, 953868026651, 4768952712765, 23843601302357, 119214519727383, 596062138283711
(list; graph; listen)
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OFFSET
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1,1
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FORMULA
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a(n)=(5^n+2*3^n+1)/4
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EXAMPLE
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For n=2 the a(2)=11 numbers are 11, 33, 55, 57, 59, 75, 77, 79, 95, 97, 99
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CROSSREFS
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Sequence in context: A074532 A049186 A049160 this_sequence A049177 A080243 A001003
Adjacent sequences: A146083 A146084 A146085 this_sequence A146087 A146088 A146089
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KEYWORD
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base,easy,nonn
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AUTHOR
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Jake Foster (jake.foster(AT)nau.edu), Oct 27 2008
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