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A001446 (4^n + 4^[ n/2 ] )/2. 1
10, 34, 136, 520, 2080, 8224, 32896, 131200, 524800, 2097664, 8390656, 33556480, 134225920, 536879104, 2147516416, 8589967360, 34359869440, 137439084544, 549756338176, 2199023779840, 8796095119360 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

James Spahlinger, Table of n, a(n) for n = 2..1001

FORMULA

G.f.: x^2[10-6x-40x^2]/[1-4x)(1-4x^2)].

CROSSREFS

Equals 2^(2[n/2]-1) * (A056450(n)+1). Cf. A001445.

Sequence in context: A166066 A068078 A067806 * A001890 A221810 A219591

Adjacent sequences:  A001443 A001444 A001445 * A001447 A001448 A001449

KEYWORD

nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified May 22 20:46 EDT 2013. Contains 225583 sequences.