A111108 - OEIS

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A111108

a(n) = A001333(n) - (-2)^(n-1), n > 0.

0, 5, 3, 25, 25, 131, 175, 705, 1137, 3875, 7095, 21649, 43225, 122435, 259423, 698625, 1541985, 4011971, 9107175, 23143825, 53559817, 133933475, 314086735, 776787009, 1838300625, 4512108515, 10745077143, 26237143825, 62749602745 (list; graph; refs; listen; history; internal format)

	OFFSET	`1,2`
	COMMENTS	`Conjecture: for odd primes p, p divides a(p). Note that (a(n)) and A001333 have different offsets.` `The conjecture follows from the formula A001333(n) = ((1-sqrt(2))^n + (1+sqrt(2))^n)/2. - Max Alekseyev (maxale(AT)gmail.com), Oct 16 2005`
	CROSSREFS	`Cf. A001333, A000204.` `Sequence in context: A168253 A181351 A032532 * A038245 A178640 A189747` `Adjacent sequences: A111105 A111106 A111107 * A111109 A111110 A111111`
	KEYWORD	`easy,nonn`
	AUTHOR	`Creighton Dement (creighton.k.dement(AT)uni-oldenburg.de), Oct 14 2005`

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Last modified February 16 20:09 EST 2012. Contains 205958 sequences.