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A006480
De Bruijn's s(3,n): (3n)!/(n!)^3.
(Formerly M4284)
+0
17
1, 6, 90, 1680, 34650, 756756, 17153136, 399072960, 9465511770, 227873431500, 5550996791340, 136526995463040, 3384731762521200, 84478098072866400, 2120572665910728000, 53494979785374631680, 1355345464406015082330
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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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