%I #5 Mar 04 2018 21:17:27
%S 1,4,29,286,3511,51668,888889,17538454,390892451,9720791092,
%T 267004296901,8031916155134,262709978263279,9285541905849316,
%U 352765522430193905,14337731083770642838,620867368421052631579
%N A subdiagonal of number array A083064.
%F a(n) = ((n+2)*(n+4)^n + 1)/(n+3).
%Y Cf. A083071, A083069.
%K easy,nonn
%O 0,2
%A _Paul Barry_, Apr 21 2003