%I #8 Dec 04 2015 13:39:34
%S 1,2,3,-4,5,6,7,-8,9,-10,11,-12,13,-14,15,-16,17,18,19,-20,21,-22,-23,
%T 24,-25,26,-27,28,-29,30,-31,32,33,34,-35,36,-37,-38,39,-40,41,-42,43,
%U -44,45,-46,47,-48,49,-50,51,-52,53,-54,55,-56,57,-58,59,-60,61,-62,63
%N First differences of Recamán's sequence A005132.
%F a(n) = A005132(n)-A005132(n-1) = n*A160357(n).
%F As a set, A160356 = A057165 union -A057166.
%Y Cf. A005132, A057165, A057166, A065056, A160357.
%K sign
%O 1,2
%A _M. F. Hasler_, Jun 03 2009