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A077849
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Expansion of (1-x)^(-1)/(1-2*x-x^2-x^3).
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2
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1, 3, 8, 21, 54, 138, 352, 897, 2285, 5820, 14823, 37752, 96148, 244872, 623645, 1588311, 4045140, 10302237, 26237926, 66823230, 170186624, 433434405, 1103878665, 2811378360, 7160069791, 18235396608, 46442241368, 118279949136, 301237536249, 767197263003
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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LINKS
| Index to sequences with linear recurrences with constant coefficients, signature (3,-1,0,-1)
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MAPLE
| A077939 := proc(n) if n< 0 then 0; else coeftayl( 1/(1-2*x-x^2-x^3) , x=0, n) ; end if; end proc:
A077849 := proc(n) (-1+4*A077939(n)+2*A077939(n-1)+A077939(n-2))/3 ; end proc:
seq(A077849(n), n=0..20) ; # R. J. Mathar, Mar 22 2011
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CROSSREFS
| Sequence in context: A103446 A094723 A127358 * A135473 A190139 A005580
Adjacent sequences: A077846 A077847 A077848 * A077850 A077851 A077852
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KEYWORD
| nonn
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com), Nov 17 2002
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