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a(n) = (n-4)^(n-3) - (n-3)^(n-4) + 1.
2

%I #13 Aug 14 2020 19:47:32

%S 0,0,0,18,400,7850,162288,3667650,91171008,2486784402,74062575400,

%T 2395420006034,83695120256592,3143661612445146,126375169532421600,

%U 5415486851106043650,246486713303685957376

%N a(n) = (n-4)^(n-3) - (n-3)^(n-4) + 1.

%H Harvey P. Dale, <a href="/A111454/b111454.txt">Table of n, a(n) for n = 4..389</a>

%F a(n) = A007925(n-4) + 1. - _Mathew Englander_, Aug 14 2020

%t Table[(n-4)^(n-3)-(n-3)^(n-4)+1,{n,4,20}] (* _Harvey P. Dale_, Oct 05 2019 *)

%Y Cf. A007925.

%K nonn

%O 4,4

%A Robert J. Reid (greencroft57(AT)yahoo.co.uk), Nov 14 2005

%E More terms from _R. J. Mathar_, Feb 26 2008