A155051 - OEIS

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A155051

Expansion of c(x^2)*(1+x)/(1-x), c(x) the g.f. of A000108.

1, 2, 3, 4, 6, 8, 13, 18, 32, 46, 88, 130, 262, 394, 823, 1252, 2682, 4112, 8974, 13836, 30632, 47428, 106214, 165000, 373012, 581024, 1323924, 2066824, 4741264, 7415704, 17110549, 26805394, 62163064, 97520734, 227165524 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	COMMENTS	`Row sums of A155050.`
	FORMULA	`a(n)=2sum{k=0..n, C(k/2)(1+(-1)^k)/2}-C(n/2)(1+(-1)^n)/2, C(n)=A000108;` `a(n)=(C(n/2)+2sum{k=0..(n/2-1), C(k)})(1+(-1)^n)/2+sum{k=0..n/2, C(k)}(1-(-1)^n), C(n)=A000108.`
	CROSSREFS	`Sequence in context: A094372 A039880 A000029 * A018137 A084239 A049708` `Adjacent sequences: A155048 A155049 A155050 * A155052 A155053 A155054`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Jan 19 2009`

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Last modified February 15 02:50 EST 2012. Contains 205694 sequences.