id:A050542 - OEIS Search Results

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Iterated triangular numbers.

+0
2

5, 15, 120, 7260, 26357430, 347357071281165, 60328467484514345085777519195, 1819761994515052295911016533077539330911500847167185483610 (list; graph; listen)

	OFFSET	`0,1`
	FORMULA	`a(n)=binomial(a(n-1)+1, 2), a(0)=5`
	CROSSREFS	`A000217, A007501, A013589.` `Sequence in context: A077702 A088418 A080490 this_sequence A091096 A116957 A124209` `Adjacent sequences: A050539 A050540 A050541 this_sequence A050543 A050544 A050545`
	KEYWORD	`easy,nice,nonn`
	AUTHOR	`Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Dec 29 1999`

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Last modified December 3 22:15 EST 2009. Contains 170310 sequences.

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