A013589 - OEIS

This site is supported by donations to The OEIS Foundation.

A013589

a(n+1) = a(n)*(a(n)+1)/2.

4, 10, 55, 1540, 1186570, 703974775735, 247790242435923759782980, 30700002123226936025189367747945843590228731690, 471245065183069190019624521318729501785547966685566656416776916445985874756815447988119493895 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,1`
	LINKS	`Index entries for sequences of form a(n+1)=a(n)^2 + ...`
	MAPLE	`f := proc(n) options remember; if n = 0 then 4 else 1/2f(n-1)(f(n-1)+1) fi end`
	MATHEMATICA	`a=4; lst={a}; Do[b=(a+1)*a/2; AppendTo[lst, b]; a=b, {n, 1, 9}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Mar 16 2010]`
	CROSSREFS	`Sequence in context: A192444 A197902 A096423 * A002290 A104363 A092190` `Adjacent sequences: A013586 A013587 A013588 * A013590 A013591 A013592`
	KEYWORD	`nonn`
	AUTHOR	`Carl Bellinger (carlb(AT)ctron.com)`
	EXTENSIONS	`One more term, Mathematica program from Vladimir Orlovsky (4vladimir(AT)gmail.com), Mar 16 2010`

Content is available under The OEIS End-User License Agreement .

Last modified February 16 07:10 EST 2012. Contains 205874 sequences.