id:A051677 - OEIS Search Results

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Tetrahedron-tree numbers: a(n)=sum(b(m),m=1..n), b(m)=1, 1,3, 1,3,6, 1,3,6,10,..., 1,2,...,i*(i+1)2.

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1, 2, 5, 6, 9, 15, 16, 19, 25, 35, 36, 39, 45, 55, 70, 71, 74, 80, 90, 105, 126, 127, 130, 136, 146, 161, 182, 210, 211, 214, 220, 230, 245, 266, 294, 330, 331, 334, 340, 350, 365, 386, 414, 450, 495, 496, 499, 505, 515, 530, 551, 579, 615, 660, 715, 716, 719 (list; graph; listen)

	OFFSET	`1,2`
	FORMULA	`a(n(n+1)/2+m)=n(n+1)(n+2)(n+3)/24 + m(m+1)(m+2)/6= A000332(n)+A000292(m), m=0...n+1, n=1, 2, 3..`
	CROSSREFS	`A000332, A000292.` `Sequence in context: A103982 A030488 A163782 this_sequence A122965 A054463 A007503` `Adjacent sequences: A051674 A051675 A051676 this_sequence A051678 A051679 A051680`
	KEYWORD	`easy,nice,nonn`
	AUTHOR	`Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de)`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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