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A055270
a(n)=7a(n-1)+(-1^n)*binomial(2,2-n); a(-1)=0.
+0
2
1, 5, 36, 252, 1764, 12348, 86436, 605052, 4235364, 29647548, 207532836, 1452729852, 10169108964, 71183762748, 498286339236, 3488004374652, 24416030622564, 170912214357948, 1196385500505636, 8374698503539452
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Maintained by
N. J. A. Sloane
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Last modified December 1 19:22 EST 2009. Contains 167811 sequences.
AT&T Labs Research
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