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Search: id:A026937
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| 1, 3, 10, 30, 87, 245, 676, 1836, 4925, 13079, 34446, 90090, 234227, 605865, 1560200, 4002072, 10230201, 26069995, 66251090, 167941494, 424753615, 1072057117, 2700704172, 6791746500, 17052595573, 42752015487, 107035180630
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OFFSET
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0,2
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FORMULA
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G.f.: (1-x)/(1-2x-x^2)^2.
Convolution of A000129 and A001333, after making allowances for offsets - Graeme McRae (g_m(AT)mcraefamily.com), Aug 03 2006
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MAPLE
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with (combinat):seq(add(fibonacci(n, 2), k=0..n)/2, n=1..27); - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 25 2008
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CROSSREFS
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Sequence in context: A117869 A092756 A027205 this_sequence A094306 A026109 A026327
Adjacent sequences: A026934 A026935 A026936 this_sequence A026938 A026939 A026940
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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