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%I #5 Mar 04 2018 21:19:10
%S 1,3,19,173,2001,28087,465011,8888889,192922993,4690709411,
%T 126370284195,3738060156613,120478742327009,4203359652212463,
%U 157854212399438371,6349779403743490289,272416890591642213921,12417347368421052631579
%N First subdiagonal of number array A083064.
%F a(n) = ((n+1)*(n+3)^n + 1)/(n+2).
%Y Cf. A083069, A083070.
%K easy,nonn
%O 0,2
%A _Paul Barry_, Apr 21 2003