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Search: id:A140253
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| -1, 1, 2, 7, 14, 31, 62, 127, 254, 511, 1022, 2047, 4094, 8191, 16382
(list; graph; listen)
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OFFSET
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0,3
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COMMENT
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Second inverse binomial transform is 1, 1, 4, -2, 10, -14, 34, -62 = 1, A135440 signed. a(2n)+a(2n+1)= 0, 9, 45, 189 = 9*A002450.
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FORMULA
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a(n+1)-2a(n)=period 2:repeat 3, 0 = A010674(n+1).Also a(n)+period 2:repeat 2, 1 or A000034(n+1)=A000079.
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CROSSREFS
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Sequence in context: A018437 A120739 A034791 this_sequence A018453 A000147 A128902
Adjacent sequences: A140250 A140251 A140252 this_sequence A140254 A140255 A140256
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KEYWORD
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sign,uned
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AUTHOR
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Paul Curtz (bpcrtz(AT)free.fr), Jun 23 2008
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