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Search: id:A027271
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| 1, 4, 18, 48, 180, 432, 1512, 3456, 11664, 25920, 85536, 186624, 606528, 1306368, 4199040, 8957952, 28553472, 60466176, 191476224, 403107840, 1269789696, 2660511744, 8344332288, 17414258688, 54419558400, 113192681472
(list; graph; listen)
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OFFSET
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0,2
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FORMULA
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G.f.: (1+4x+6x^2)/(1-6x^2)^2 = dif((1+3x)/(1-6x^2), x); a(n)=6^(n/2)((sqrt(3)-sqrt(2))(-1)^n+(sqrt(3)+sqrt(2)))(n+1)sqrt(3)/6. - Paul Barry (pbarry(AT)wit.ie), Mar 03 2004
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CROSSREFS
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Sequence in context: A163188 A045991 A114364 this_sequence A073991 A052642 A102928
Adjacent sequences: A027268 A027269 A027270 this_sequence A027272 A027273 A027274
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KEYWORD
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nonn
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AUTHOR
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Clark Kimberling (ck6(AT)evansville.edu)
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