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A020990 Sum (-1)^k*A020985(k), k=0..n. 0
1, 0, 1, 2, 3, 2, 1, 0, 1, 0, 1, 2, 1, 2, 3, 4, 5, 4, 5, 6, 7, 6, 5, 4, 3, 4, 3, 2, 3, 2, 1, 0, 1, 0, 1, 2, 3, 2, 1, 0, 1, 0, 1, 2, 1, 2, 3, 4, 3, 4, 3, 2, 1, 2, 3, 4, 5, 4, 5, 6, 5, 6, 7, 8, 9, 8, 9, 10, 11, 10, 9, 8, 9, 8, 9, 10, 9, 10, 11 (list; graph; refs; listen; history; internal format)
OFFSET

0,4

REFERENCES

J. Brillhart and P. Morton, A case study in mathematical research: the Golay-Rudin-Shapiro sequence, Amer. Math. Monthly, 103 (1996) 854-869.

CROSSREFS

Sequence in context: A165592 A059285 A165578 * A037891 A037899 A037837

Adjacent sequences:  A020987 A020988 A020989 * A020991 A020992 A020993

KEYWORD

nonn

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified February 17 08:21 EST 2012. Contains 205998 sequences.