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A097140 Interleave n and 1-n. 2
0, 1, 1, 0, 2, -1, 3, -2, 4, -3, 5, -4, 6, -5, 7, -6, 8, -7, 9, -8, 10, -9, 11, -10, 12, -11, 13, -12, 14, -13, 15, -14, 16, -15, 17, -16, 18, -17, 19, -18, 20, -19, 21, -20, 22, -21, 23, -22, 24, -23, 25, -24, 26, -25, 27, -26, 28, -27, 29, -28, 30, -29, 31, -30, 32, -31 (list; graph; refs; listen; history; internal format)
OFFSET

0,5

COMMENTS

Partial sums are A097141. Binomial transform is x(1+x)/(1-2x), or A003945 with a leading 0.

FORMULA

G.f. : x(1+2x)/((1-x)(1+x)^2); a(n)=3/4+(2n-3)(-1)^n/4.

CROSSREFS

Sequence in context: A171618 A026238 A066136 * A028242 A030451 A029162

Adjacent sequences:  A097137 A097138 A097139 * A097141 A097142 A097143

KEYWORD

easy,sign

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Jul 29 2004

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Last modified February 16 10:07 EST 2012. Contains 205904 sequences.