A048746 - OEIS

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A048746

Partial sums of A048655.

1, 6, 17, 44, 109, 266, 645, 1560, 3769, 9102, 21977, 53060, 128101, 309266, 746637, 1802544, 4351729, 10506006, 25363745, 61233500, 147830749, 356895002, 861620757, 2080136520, 5021893801, 12123924126 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`a(n)=2a(n-1)+a(n-2)+4; a(0)=1, a(1)=6.` `a(n)=[ {(5+3sqrt(2))(1+sqrt(2)^n - (5-3sqrt(2))(1-sqrt(2))^n}/2sqrt(2) ]-2`
	CROSSREFS	`Sequence in context: A099858 A062020 A066183 * A026382 A054492 A128525` `Adjacent sequences: A048743 A048744 A048745 * A048747 A048748 A048749`
	KEYWORD	`easy,nonn`
	AUTHOR	`Barry E. Williams`
	EXTENSIONS	`Corrected and extended by T. D. Noe (noe(AT)sspectra.com), Nov 07 2006`

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Last modified February 16 12:41 EST 2012. Contains 205909 sequences.