|
| |
|
|
A146086
|
|
Number of n-digit numbers with each digit odd where the digits 1 and 3 occur an even number of times.
|
|
0
| |
|
|
3, 11, 45, 197, 903, 4271, 20625, 100937, 498123, 2470931, 12295605, 61300877, 305972943, 1528270391, 7636568985, 38168496017, 190799433363, 953868026651, 4768952712765, 23843601302357, 119214519727383, 596062138283711
(list; graph; refs; listen; history; internal format)
|
|
|
|
OFFSET
| 1,1
|
|
|
FORMULA
| a(n)=(5^n+2*3^n+1)/4
|
|
|
EXAMPLE
| For n=2 the a(2)=11 numbers are 11, 33, 55, 57, 59, 75, 77, 79, 95, 97, 99
|
|
|
CROSSREFS
| Sequence in context: A049186 A049160 A191243 * A049177 A080243 A001003
Adjacent sequences: A146083 A146084 A146085 * A146087 A146088 A146089
|
|
|
KEYWORD
| base,easy,nonn
|
|
|
AUTHOR
| Jake Foster (jake.foster(AT)nau.edu), Oct 27 2008
|
| |
|
|
