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A053871
a(0) = 1; a(1) = 0; a(n) = 2 (n - 1)*(a(n - 1) + a(n - 2)).
+0
15
1, 0, 2, 8, 60, 544, 6040, 79008, 1190672, 20314880, 387099936, 8148296320, 187778717632, 4702248334848, 127140703364480, 3691602647581184, 114562300528369920, 3784124901630435328, 132555364873399378432
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Maintained by
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Last modified December 16 17:18 EST 2009. Contains 170825 sequences.
AT&T Labs Research
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