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A158196 Expansion of (1-x^2*c(x)^4)/(1-3*x*c(x)^2), c(x) the g.f. of A000108. 1
1, 3, 14, 71, 370, 1950, 10332, 54895, 292106, 1555706, 8289732, 44186710, 235575028, 1256093084, 6698073528, 35719158591, 190488112122, 1015885525794, 5417869631028, 28894620083346, 154102115782812 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

Apply the inverse of the Riordan array (1/(1-x^2),x/(1+x)^2) to 3^n. Hankel transform is A001653.

CROSSREFS

Cf. A090317.

Sequence in context: A186765 A109792 A137177 * A191649 A009637 A098648

Adjacent sequences:  A158193 A158194 A158195 * A158197 A158198 A158199

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Mar 13 2009

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Last modified February 15 15:20 EST 2012. Contains 205823 sequences.