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 A186035 a(n) = (-1)^A186034(n). 3
 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0 COMMENTS Hankel transform is A186036. LINKS Antti Karttunen, Table of n, a(n) for n = 0..4095 FORMULA a(n) = (-1)^log_2(A001006(n)/numerator(A001006(n)/2^n)). a(n) = (-1)^A007814(A001006(n)). - Antti Karttunen, Aug 12 2017 PROG (Python) from itertools import count, islice def A186035_gen(): # generator of terms a, b = 1, 1 yield from (1, 1) for n in count(2): a, b = b, (b*(2*n+1)+a*3*(n-1))//(n+2) yield 1-(((~b&b-1).bit_length()&1)<<1) A186035_list = list(islice(A186035_gen(), 30)) # Chai Wah Wu, Jul 08 2022 CROSSREFS Cf. A001006, A007814, A186034. Sequence in context: A122188 A158388 A162285 * A358766 A359154 A359166 Adjacent sequences: A186032 A186033 A186034 * A186036 A186037 A186038 KEYWORD sign,easy AUTHOR Paul Barry, Feb 11 2011 EXTENSIONS More terms from Antti Karttunen, Aug 12 2017 STATUS approved

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Last modified March 26 11:37 EDT 2023. Contains 361549 sequences. (Running on oeis4.)