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a(n) = n*(n+1)/2 mod 512.
0

%I #5 Dec 01 2018 12:33:16

%S 0,1,3,6,10,15,21,28,36,45,55,66,78,91,105,120,136,153,171,190,210,

%T 231,253,276,300,325,351,378,406,435,465,496,16,49,83,118,154,191,229,

%U 268,308,349,391,434,478,11,57,104,152,201,251,302,354,407,461,4,60,117,175,234

%N a(n) = n*(n+1)/2 mod 512.

%t Mod[#,512]&/@Accumulate[Range[0,60]] (* _Harvey P. Dale_, Dec 01 2018 *)

%Y See A105198 for further information.

%K nonn

%O 0,3

%A _Oscar Takeshita_, May 01 2005