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 A257971 First differences of A006921. 3
 0, 2, -1, 5, -2, 8, -5, 21, -8, 34, -21, 81, -34, 128, -81, 337, -128, 546, -337, 1301, -546, 2056, -1301, 5381, -2056, 8706, -5381, 20737, -8706, 32768, -20737, 86273, -32768, 139778, -86273, 333061, -139778, 526344, -333061, 1377557, -526344, 2228770 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS a(2*n) = - A168081(n), a(2*n+1) = A168081(n+2); a(2*n+4) = - a(2*n+1). LINKS Reinhard Zumkeller, Table of n, a(n) for n = 0..1000 PROG (Haskell) a257971 n = a257971_list !! n a257971_list = zipWith (-) (tail a006921_list) a006921_list CROSSREFS Cf. A006911, A168081. Sequence in context: A014682 A111361 A167160 * A205377 A082010 A318972 Adjacent sequences:  A257968 A257969 A257970 * A257972 A257973 A257974 KEYWORD sign AUTHOR Reinhard Zumkeller, Jul 14 2015 STATUS approved

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Last modified April 20 09:59 EDT 2019. Contains 322309 sequences. (Running on oeis4.)