id:A137697 - OEIS Search Results

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a(n) = x(n) * 2^((n mod 2 - 1)/2), with x(n)=Sum(x(k)*x(n-k-1):0<=k<n), x(0)=SQRT(2).

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1, 2, 4, 20, 56, 336, 1056, 6864, 22880, 155584, 537472, 3762304, 13312768, 95091200, 342328320, 2481880320, 9051563520, 66378132480 (list; graph; listen)

	OFFSET	`0,2`
	EXAMPLE	`x(1) = 2;` `x(2) = 5.6568... = a(2)SQRT(2);` `x(3) = 20;` `x(4) = 79.1959... = a(4)SQRT(2);` `x(5) = 336;` `x(6) = 1493.4095... = a(6)*SQRT(2).`
	CROSSREFS	`Cf. A000108.` `Sequence in context: A059206 A052004 A027741 this_sequence A009336 A009291 A081440` `Adjacent sequences: A137694 A137695 A137696 this_sequence A137698 A137699 A137700`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), Feb 06 2008`

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Last modified September 5 01:44 EDT 2008. Contains 143476 sequences.

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