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A281997
a(n) = (n-1)^n * n^n.
0
0, 4, 216, 20736, 3200000, 729000000, 230539333248, 96717311574016, 51998697814228992, 34867844010000000000, 28531167061100000000000, 27982542656501458535448576, 32405578483833249047003529216, 43752153272681450786889799450624
OFFSET
1,2
FORMULA
a(n) ~ A174881(n) / e^2.
a(n) = A007778(n-1)*A000312(n). - Felix Fröhlich, Feb 05 2017
MATHEMATICA
Table[(n (n - 1))^n, {n, 14}] (* Michael De Vlieger, Feb 05 2017 *)
PROG
(PARI) a(n) = (n*(n-1))^n;
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Daniel Suteu, Feb 04 2017
STATUS
approved