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Search: id:A036543
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| 1, 9, 33, 105, 321, 969, 2913, 8745, 26241, 78729, 236193, 708585, 2125761, 6377289, 19131873, 57395625, 172186881, 516560649, 1549681953, 4649045865, 13947137601, 41841412809, 125524238433, 376572715305, 1129718145921
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OFFSET
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0,2
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FORMULA
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Binomial transform of A084242. Second binomial transform of periodic sequence A010688. - Paul Barry (pbarry(AT)wit.ie), May 23 2003
a(n)=4*3^n-3; G.f.: (1+5x)/((1-x)(1-3x)); G.f.: 4exp(3x)-3exp(x). - Paul Barry (pbarry(AT)wit.ie), May 23 2003
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CROSSREFS
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n-th difference of a(n), a(n-1), ..., a(0) is 2^(n+2) for n=1, 2, 3...
Sequence in context: A112888 A048479 A031880 this_sequence A140413 A097804 A137627
Adjacent sequences: A036540 A036541 A036542 this_sequence A036544 A036545 A036546
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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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