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Search: id:A026056
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| A026056 |
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a(n) = (d(n)-r(n))/5, where d = A026054 and r is the periodic sequence with fundamental period (3,3,0,0,4). |
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+0
2
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| 2, 5, 10, 16, 23, 33, 45, 60, 77, 96, 119, 145, 175, 208, 244, 285, 330, 380, 434, 492, 556, 625, 700, 780, 865, 957, 1055, 1160, 1271, 1388, 1513, 1645, 1785, 1932, 2086, 2249, 2420, 2600, 2788, 2984, 3190, 3405, 3630, 3864, 4107, 4361, 4625, 4900, 5185, 5480, 5787, 6105, 6435, 6776, 7128, 7493
(list; graph; listen)
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OFFSET
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3,1
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FORMULA
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a(n)=(n + 2)*(n + 3)*(n + 13)/30 - 1/5*(2 + (1/2 + 7/10*5^(1/2))*cos(2*n*Pi/5) + ( - 1/10*2^(1/2)*(5 + 5^(1/2))^(1/2))*sin(2*n*Pi/5) + (1/2 - 7/10*5^(1/2))*cos(4*n*Pi/5) + ( - 1/10*2^(1/2)*(5 - 5^(1/2))^(1/2))*sin(4*n*Pi/5)) [From Richard Choulet (richardchoulet(AT)yahoo.fr), Dec 14 2008]
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CROSSREFS
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A152893 [From Richard Choulet (richardchoulet(AT)yahoo.fr), Dec 14 2008]
Sequence in context: A086849 A131938 A031871 this_sequence A084587 A001859 A011903
Adjacent sequences: A026053 A026054 A026055 this_sequence A026057 A026058 A026059
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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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