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A162993
The second left hand column of triangle A162990.
2
9, 144, 3600, 129600, 6350400, 406425600, 32920473600, 3292047360000, 398337730560000, 57360633200640000, 9693947010908160000, 1900013614137999360000, 427503063181049856000000, 109440784174348763136000000, 31628386626386792546304000000
OFFSET
2,1
FORMULA
a(n) = ((n+1)!/2)^2 for n = 2, 3, ... .
a(n) = A001710(n+1)^2.
MATHEMATICA
Array[((#+1)!/2)^2 &, 20, 2] (* Paolo Xausa, Apr 01 2024 *)
CROSSREFS
A001044 and A162994 are two other left hand columns.
A001710(n+1) equals the square root of a(n).
Sequence in context: A067415 A069134 A034829 * A094594 A173213 A223371
KEYWORD
easy,nonn
AUTHOR
Johannes W. Meijer, Jul 21 2009
STATUS
approved