n^n + (-1)^n (n-1)^(n-1).
0, 5, 23, 283, 2869, 49781, 776887, 17600759, 370643273, 10387420489, 275311670611, 9201412118867, 293959006143997, 11414881932150269, 426781883555301359, 18884637964090410991, 808793517812627212561, 40173648337182874339601
1
This sequence is used implicitly in sequences S000980 to S000988.
T. D. Noe, Plot of 300 terms
T. D. Noe, Table of 300 terms
(Mma) Table[n^n + (-1)^n (n - 1)^(n - 1), {n, 20}]
nonn
T. D. Noe, Mar 21 2017