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A061172 Third column of Lucas bisection triangle (odd part). 4
9, 120, 753, 3612, 15040, 57366, 206115, 709152, 2360943, 7659870, 24340184, 76031100, 234116493, 712166952, 2143779645, 6394719216, 18923041360, 55601888562, 162350117703, 471371537040, 1361642740059 (list; graph; refs; listen; history; internal format)
OFFSET

0,1

COMMENTS

Numerator of g.f. is row polynomial sum(A061187(2,m)*x^m,m=0..4).

FORMULA

a(n)=A060924(n+2, 2).

G.f.: (3-2*x)*(4*x^3-9*x^2+15*x+3)/(1-3*x+x^2)^3.

CROSSREFS

Cf. A002548, 2*A061171.

Sequence in context: A130652 A054051 A159660 * A167593 A024487 A002691

Adjacent sequences:  A061169 A061170 A061171 * A061173 A061174 A061175

KEYWORD

nonn,easy

AUTHOR

Wolfdieter Lang (wolfdieter.lang(AT)physik.uni-karlsruhe.de), Apr 20 2001

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Last modified February 15 05:15 EST 2012. Contains 205694 sequences.