A104538 - OEIS

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A104538

Expansion of (1+2x)/(1+2x+4x^2).

1, 0, -4, 8, 0, -32, 64, 0, -256, 512, 0, -2048, 4096, 0, -16384, 32768, 0, -131072, 262144, 0, -1048576, 2097152, 0, -8388608, 16777216, 0, -67108864, 134217728, 0, -536870912, 1073741824, 0, -4294967296, 8589934592, 0, -34359738368, 68719476736, 0, -274877906944, 549755813888, 0 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,3`
	FORMULA	`a(n)=2^nU(2n, 1/2), U(n, x) Chebyshev polynomial of second kind; a(n)=2^nA057078(n).`
	CROSSREFS	`Sequence in context: A125507 A198583 * A120580 A205508 A013328 A143462` `Adjacent sequences: A104535 A104536 A104537 * A104539 A104540 A104541`
	KEYWORD	`easy,sign`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Mar 13 2005`

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Last modified February 16 15:48 EST 2012. Contains 205930 sequences.