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A049853
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a(n)=Sum{a(k): k=0,1,2,...,n-3,n-1}; a(n-2) is not a summand; 2 initial terms required.
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4
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1, 2, 2, 3, 6, 11, 19, 33, 58, 102, 179, 314, 551, 967, 1697, 2978, 5226, 9171, 16094, 28243, 49563, 86977, 152634, 267854, 470051, 824882, 1447567, 2540303, 4457921, 7823106, 13728594, 24092003, 42278518, 74193627
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| Reinhard Zumkeller, Table of n, a(n) for n = 0..1000
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FORMULA
| a(n)=2*a(n-1)-a(n-2)+a(n-3); 3 initial terms required.
a(n)=a(n-1)+a(n-2)+a(n-4) for n>3. [Reinhard Zumkeller, Aug 06 2011]
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PROG
| (Haskell)
a049853 n = a049853_list !! n
a049853_list = 1 : 2 : 2 : 3 :
zipWith (+) a049853_list
(zipWith (+) (drop 2 a049853_list) (drop 3 a049853_list))
-- Reinhard Zumkeller, Aug 06 2011
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CROSSREFS
| Cf. A070550.
Sequence in context: A070550 A145778 A102762 * A162599 A064319 A064674
Adjacent sequences: A049850 A049851 A049852 * A049854 A049855 A049856
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KEYWORD
| nonn
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AUTHOR
| Clark Kimberling (ck6(AT)evansville.edu)
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