Squares of double factorials: (1*3*5*...*(2n-1))^2 = ((2*n-1)!!)^2.
1, 1, 9, 225, 11025, 893025, 108056025, 18261468225, 4108830350625
5 seqfan posts
Wed Oct 21 18:54:36 CEST 2009 [seqfan] Re: more on double factorials/Penson
Tue Oct 20 21:06:35 CEST 2009 [seqfan] more on double factorials/Penson
Tue Oct 20 17:20:36 CEST 2009 [seqfan] Re: definition of double factorial
Tue Oct 20 13:41:09 CEST 2009 [seqfan] Re: definition of double factorial
Tue Oct 20 12:35:40 CEST 2009 [seqfan] definition of double factorial
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