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%I #6 Sep 08 2022 08:45:09
%S 1,5,55,481,10501,117181,3879331,52751105,2351234953,37766866501,
%T 2120129149711,39311679607201,2663716583547085,56019878838007085,
%U 4448878347069812251,104660471059169187841,9534251497305019644433
%N Diagonal of square array A081297.
%H Vincenzo Librandi, <a href="/A081300/b081300.txt">Table of n, a(n) for n = 0..200</a>
%F a(n) = ((n+1)^(n+3)-(-n)^(n+3))/(2*n+1).
%t Table[((n + 1)^(n + 3) - (-n)^(n + 3)) / (2 n + 1), {n, 0, 20}] (* _Vincenzo Librandi_, Aug 07 2013 *)
%o (Magma) [((n+1)^(n+3)-(-n)^(n+3))/(2*n+1): n in [0..20]]; // _Vincenzo Librandi_, Aug 07 2013
%Y Cf. A081298, A081299, A081301, A081302.
%K easy,nonn
%O 0,2
%A _Paul Barry_, Mar 17 2003
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