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%I #6 Sep 08 2022 08:45:09
%S 1,1,13,41,991,5461,194713,1545265,73022131,758924981,44709567013,
%T 575279386969,40614439994311,623479972408021,51316625644764721,
%U 915589327332039905,86090052046429522747,1750836276286883890741
%N Subdiagonal of square array A081297.
%H Vincenzo Librandi, <a href="/A081301/b081301.txt">Table of n, a(n) for n = 0..200</a>
%F a(n) = ((n+2)^(n+1)-(-(n+1))^(n+1))/(2*n+3).
%t Table[((n + 2)^(n + 1) - (-(n + 1))^(n + 1)) / (2 n + 3), {n, 0, 20}] (* _Vincenzo Librandi_, Aug 08 2013 *)
%o (Magma) [((n+2)^(n+1)-(-(n+1))^(n+1))/(2*n+3):n in [0..20]]; // _Vincenzo Librandi_, Aug 08 2013
%Y Cf. A081298, A081299, A081300, A081302.
%K easy,nonn
%O 0,3
%A _Paul Barry_, Mar 17 2003
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