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Search: id:A020992
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A020992 a(n)=a(n-1)+a(n-2)+a(n-3). +0
3
0, 2, 1, 3, 6, 10, 19, 35, 64, 118, 217, 399, 734, 1350, 2483, 4567, 8400, 15450, 28417, 52267, 96134, 176818, 325219, 598171, 1100208, 2023598, 3721977, 6845783, 12591358, 23159118, 42596259, 78346735, 144102112 (list; graph; listen)
OFFSET

0,2
FORMULA

G.f.: x(2-x)/(1-x-x^2-x^3).

CROSSREFS

Sequence in context: A024866 A076058 A098124 this_sequence A025110 A075346 A104529

Adjacent sequences: A020989 A020990 A020991 this_sequence A020993 A020994 A020995

KEYWORD

nonn

AUTHOR

njas

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Last modified August 19 23:53 EDT 2008. Contains 142930 sequences.

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