A083231 - OEIS

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A083231

(3*5^n+(-3)^n)/4.

1, 3, 21, 87, 489, 2283, 11901, 58047, 294609, 1459923, 7338981, 36576807, 183238329, 915128763, 4578832461, 22884596367, 114451679649, 572172304803, 2861119804341, 14304824180727, 71526445426569, 357625253564043 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	LINKS	`Vincenzo Librandi, Table of n, a(n) for n = 0..300`
	FORMULA	`a(n) = (35^n+(-3)^n)/4.` `G.f.: (1+x)/((1-5x)(1+3x)).` `E.g.f.: (3exp(5x)+exp(-3*x)/4.`
	PROG	`(MAGMA) [(3*5^n+(-3)^n)/4: n in [0..25]]; // Vincenzo Librandi, Jun 29 2011`
	CROSSREFS	`Cf. A083232.` `Sequence in context: A112851 A034490 A071351 * A129755 A059826 A108970` `Adjacent sequences: A083228 A083229 A083230 * A083232 A083233 A083234`
	KEYWORD	`easy,nonn`
	AUTHOR	`Paul Barry (pbarry(AT)wit.ie), Apr 23 2003`

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Last modified February 15 16:49 EST 2012. Contains 205824 sequences.