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A142988
a(1) = 1, a(2) = 3, a(n+2) = 3*a(n+1)+(n+1)*(n+3)*a(n).
+0
6
1, 3, 17, 96, 696, 5448, 49752, 492480, 5457600, 65128320, 850296960, 11864240640, 178442611200, 2848854758400, 48517709184000, 872011090944000, 16589133517824000, 331426982928384000, 6966369015201792000
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Maintained by
N. J. A. Sloane
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njas@research.att.com
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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.
AT&T Labs Research
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