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A117615
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a(0)=0, a(1)=1, a(n)=4a(n-1)+2 for n =3,5,7,..., a(n)=4a(n-1) for n =2,4,6,....
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0, 1, 4, 18, 72, 290, 1160, 4642, 18568, 74274, 297096, 1188386, 4753544, 19014178, 76056712, 304226850, 1216907400, 4867629602, 19470518408, 77882073634, 311528294536, 1246113178146, 4984452712584, 19937810850338, 79751243401352
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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REFERENCES
| L. Rosenfeld, Nuclear Forces, section II, Interscience, New York, 1948, p 202
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MAPLE
| a:=proc(n) if n=0 then 0 elif n=1 then 1 elif n mod 2 = 1 then 4*a(n-1)+2 else 4*a(n-1) fi end: seq(a(n), n=0..24);
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MATHEMATICA
| b[0] := 0 b[1] := 1 b[n_?EvenQ] := b[n] = 4*b[n - 1] b[n_?OddQ] := b[n] = 4*b[n - 1] + 2 a = Table[b[n], {n, 0, 25}]
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CROSSREFS
| Sequence in context: A050184 A034352 A159715 * A199524 A083693 A123476
Adjacent sequences: A117612 A117613 A117614 * A117616 A117617 A117618
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KEYWORD
| nonn
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AUTHOR
| Roger L. Bagula (rlbagulatftn(AT)yahoo.com), Apr 07 2006
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EXTENSIONS
| Edited by N. J. A. Sloane (njas(AT)research.att.com), Apr 16 2006
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