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a(n) = (4*n)^n.
3

%I #17 Feb 11 2024 17:33:30

%S 1,4,64,1728,65536,3200000,191102976,13492928512,1099511627776,

%T 101559956668416,10485760000000000,1196683881290399744,

%U 149587343098087735296,20325604337285010030592,2982856619293778479415296,470184984576000000000000000

%N a(n) = (4*n)^n.

%H Vincenzo Librandi, <a href="/A091483/b091483.txt">Table of n, a(n) for n = 0..100</a>

%F E.g.f.: 1/(1 + LambertW(-4*x)). - _Ilya Gutkovskiy_, Oct 03 2017

%t Join[{1},Table[(4n)^n,{n,20}]] (* _Harvey P. Dale_, Feb 11 2024 *)

%o (PARI) a(n) = (4*n)^n; \\ _Joerg Arndt_, Feb 23 2014

%o (Magma) [(4*n)^n: n in [0..20]]; // _Vincenzo Librandi_, Feb 24 2014

%Y Cf. A062971, A091482.

%K nonn

%O 0,2

%A _Christian G. Bower_, Jan 13 2004

%E More terms from _Vincenzo Librandi_, Feb 24 2014