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A273939 a(0) = 1, a(1) = 2; for k>0, a(2*k) = k*a(2*k-1) + a(2*k-2), a(2*k+1) = a(2*k) + a(2*k-1). 1
1, 2, 3, 5, 13, 18, 67, 85, 407, 492, 2867, 3359, 23021, 26380, 207681, 234061, 2080169, 2314230, 22908239, 25222469, 275132929, 300355398, 3579042307, 3879397705, 50131814767, 54011212472, 752277576903, 806288789375, 12040320628153 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,2
LINKS
FORMULA
a(n) = A056921(n) + A056922(n).
CROSSREFS
Sequence in context: A041385 A108282 A042047 * A087763 A104735 A157976
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Sep 22 2016
STATUS
approved

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Last modified July 14 22:52 EDT 2024. Contains 374323 sequences. (Running on oeis4.)