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A035782
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Coordination sequence for C_45 lattice.
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1
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1, 4050, 2736450, 741759570, 108242937090, 9895463694162, 622155720985410, 28667877399006930, 1013960660749554690, 28517022732422789330, 655766098851343900482, 12611613545459896364370, 206678785994044883684610
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OFFSET
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0,2
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LINKS
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J. H. Conway and N. J. A. Sloane, Low-Dimensional Lattices VII: Coordination Sequences, Proc. Royal Soc. London, A453 (1997), 2369-2389 (pdf).
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FORMULA
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a(n) = [x^(2n)] ((1+x)/(1-x))^45.
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MAPLE
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seq(coeff(series(((1+x)/(1-x))^45, x, n+1), x, n), n=0..30, 2); # Muniru A Asiru, Aug 12 2018
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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Joan Serra-Sagrista (jserra(AT)ccd.uab.es)
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EXTENSIONS
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STATUS
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approved
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