id:A122039 - OEIS Search Results

Search: id:A122039

Displaying 1-1 of 1 results found.

page 1

A122039

a(n) = 2*a(n-1) - n + 4 for n>1, a(1)=1.

+0
1

1, 4, 9, 18, 35, 68, 133, 262, 519, 1032, 2057, 4106, 8203, 16396, 32781, 65550, 131087, 262160, 524305, 1048594, 2097171, 4194324, 8388629, 16777238, 33554455, 67108888, 134217753, 268435482, 536870939, 1073741852, 2147483677 (list; graph; listen)

	OFFSET	`1,2`
	COMMENT	`From a quiz.`
	LINKS	`C. P. Simoes, Teste de Desempenho Mental.`
	EXAMPLE	`1x2 + (2) = 4; 4x2 + (1) = 9; 9x2 + (0) = 18; 18x2 + (-1) = 35; 35x2 + (-2) = 68`
	PROGRAM	`(PARI) a(n)=if(n>1, 2*a(n-1)+(4-n), 1) for(n=1, 40, print1(a(n), ", "))`
	CROSSREFS	`Sequence in context: A019453 A038089 A027053 this_sequence A083706 A074896 A015713` `Adjacent sequences: A122036 A122037 A122038 this_sequence A122040 A122041 A122042`
	KEYWORD	`nonn`
	AUTHOR	`Herman Jamke (hermanjamke(AT)fastmail.fm), Sep 14 2006`

page 1

Search completed in 0.002 seconds

Last modified July 26 23:19 EDT 2008. Contains 142293 sequences.

AT&T Labs Research