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a(n) = Sum_{i=0..2n} (-1)^i * T(i,2n-i), array T as in A049747.
0

%I #9 Aug 07 2021 01:12:27

%S 0,3,9,19,33,53,59,101,109,141,211,235,275,315,353,435,511,543,609,

%T 663,749,857,919,1025,1081,1211,1281,1379,1471,1579,1705,1827,1971,

%U 2035,2171,2329,2429,2649,2735,2937,3069,3109,3301,3471,3699,3917,4011,4163,4287

%N a(n) = Sum_{i=0..2n} (-1)^i * T(i,2n-i), array T as in A049747.

%K nonn

%O 0,2

%A _Clark Kimberling_

%E More terms from _Sean A. Irvine_, Aug 06 2021