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A131732 a(4n) = 2n+1, a(4n+1) = -4n-3, a(4n+2) = 2n+2, a(4n+3) = 0. 0
1, -3, 2, 0, 3, -7, 4, 0, 5, -11, 6, 0, 7, -15, 8, 0, 9, -19, 10, 0, 11, -23, 12, 0, 13, -27, 14, 0, 15, -31, 16, 0, 17, -35, 18, 0, 19, -39, 20, 0, 21, -43, 22, 0, 23, -47, 24, 0, 25, -51, 26, 0, 27, -55, 28, 0, 29, -59, 30, 0, 31, -63, 32, 0, 33, -67, 34, 0, 35, -71, 36, 0, 37, -75, 38, 0, 39, -79, 40, 0, 41, -83, 42, 0, 43, -87, 44, 0 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

CROSSREFS

Sequence in context: A079714 A190710 A114907 * A198826 A088161 A005874

Adjacent sequences:  A131729 A131730 A131731 * A131733 A131734 A131735

KEYWORD

sign

AUTHOR

Paul Curtz (bpcrtz(AT)free.fr), Sep 17 2007

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Last modified February 16 11:43 EST 2012. Contains 205907 sequences.