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A164051
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2^(2n) + 2^(n-1).
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4
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5, 18, 68, 264, 1040, 4128, 16448, 65664, 262400, 1049088, 4195328, 16779264, 67112960, 268443648, 1073758208, 4295000064, 17179934720, 68719607808, 274878169088, 1099512152064, 4398047559680, 17592188141568, 70368748371968, 281474985099264
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| A bisection of A001445.
a(n) written in base 2: 101, 10010, 1000100, 100001000, ..., i.e. number 1, n times 0, number 1, (n-1) times 0 (see A164367). [From Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Aug 14 2009]
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FORMULA
| a(n)=A001445(2n+1) = 6*a(n-1)-8*a(n-2). G.f.: -x*(-5+12*x)/((4*x-1)*(2*x-1)).
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CROSSREFS
| Sequence in context: A158879 A199843 A109438 * A134764 A188177 A145780
Adjacent sequences: A164048 A164049 A164050 * A164052 A164053 A164054
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KEYWORD
| nonn,easy
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AUTHOR
| Jaroslav Krizek (jaroslav.krizek(AT)atlas.cz), Aug 08 2009
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EXTENSIONS
| Edited and extended by R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Aug 11 2009
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