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A087431
a(n) = 0^n/2 + 2^n*(n^2+n+2)/4.
1
1, 2, 8, 28, 88, 256, 704, 1856, 4736, 11776, 28672, 68608, 161792, 376832, 868352, 1982464, 4489216, 10092544, 22544384, 50069504, 110624768, 243269632, 532676608, 1161822208, 2524971008, 5469372416, 11811160064, 25434259456
OFFSET
0,2
COMMENTS
Binomial transform of A080335 (with additional leading 1).
FORMULA
a(n) = 2*A007466(n) for n >= 1.
G.f.: (1-4*x+8*x^2-4*x^3)/(1-2*x)^3. - Colin Barker, Mar 18 2012
MATHEMATICA
LinearRecurrence[{6, -12, 8}, {1, 2, 8, 28}, 30] (* Harvey P. Dale, Nov 26 2015 *)
CROSSREFS
Sequence in context: A135263 A048497 A118047 * A176758 A178222 A090426
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Sep 02 2003
STATUS
approved