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A093303
a(n) = (a(n-1)*(2n-1)) + 2n with a(0)=0.
+0
1
0, 2, 10, 56, 400, 3610, 39722, 516400, 7746016, 131682290, 2501963530, 52541234152, 1208448385520, 30211209638026, 815702660226730, 23655377146575200, 733316691543831232, 24199450820946430690
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified December 5 23:38 EST 2009. Contains 170428 sequences.
AT&T Labs Research
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