A118378 - OEIS

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A118378

a(1) = 1, a(n+1) = a(n)^2 + (-1)^n * n*(n+1)/2 = A000290(a(n))+A033999(n)*A000217(n).

1, 4, 10, 110, 12085, 146047246, 21329798064184488, 454960285458888331666496499822180, 206988861344833157526906045960863418528301538238377184771619952355 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	LINKS	`In dex entries for sequences of form a(n+1)=a(n)^2 + ...`
	EXAMPLE	`a(2) = a(1)^2 + (-1)^2 * 2(2+1)/2 = 11 + 13 = 4;` `a(3) = a(2)^2 + (-1)^3 3(3+1)/2 = 44 - 3*2 = 10;`
	CROSSREFS	`Sequence in context: A197851 A197865 A098449 * A203224 A198156 A003086` `Adjacent sequences: A118375 A118376 A118377 * A118379 A118380 A118381`
	KEYWORD	`nonn`
	AUTHOR	`Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 16 2006`
	EXTENSIONS	`Corrected by Don Reble (djr(AT)nk.ca), Nov 22 2006`

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Last modified February 15 14:35 EST 2012. Contains 205820 sequences.