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Second differences of the overpartitions.
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%I #4 Mar 08 2023 12:51:11

%S 1,2,2,4,6,8,12,18,24,34,48,64,88,120,158,212,282,368,484,632,816,

%T 1056,1360,1738,2220,2826,3576,4520,5696,7144,8948,11176,13908,17280,

%U 21414,26460,32638,40168

%N Second differences of the overpartitions.

%H K. Banerjee, <a href="https://doi.org/10.54550/ECA2023V3S2R12">Positivity of the second shifted difference of partitions and overpartitions: a combinatorial approach</a>, Enum. Combin. Applic. 3 (2023) # S2R12

%F a(n) = A015128(n)-2*A015128(n-1)+A015128(n-2).

%Y Cf. A015128, A211971 (1st differences).

%K nonn

%O 2,2

%A _R. J. Mathar_, Mar 08 2023