id:A046212 - OEIS Search Results

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First numerator and then denominator of central elements of Leibniz's Harmonic Triangle.

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19

1, 1, 1, 6, 1, 30, 1, 140, 1, 630, 1, 2772, 1, 12012, 1, 51480, 1, 218790, 1, 923780, 1, 3879876, 1, 16224936, 1, 67603900, 1, 280816200, 1, 1163381400, 1, 4808643120, 1, 19835652870, 1, 81676217700, 1, 335780006100, 1, 1378465288200, 1 (list; graph; listen)

	OFFSET	`1,4`
	REFERENCES	`L. Comtet, Advanced Combinatorics, Reidel, 1974, p. 83, Problem 25.`
	CROSSREFS	`Cf. A003506.` `Cf. A002457.` `Sequence in context: A147327 A145629 A118933 this_sequence A120105 A120101 A030524` `Adjacent sequences: A046209 A046210 A046211 this_sequence A046213 A046214 A046215`
	KEYWORD	`nonn,easy`
	AUTHOR	`Mohammad K. Azarian (ma3(AT)evansville.edu)`
	EXTENSIONS	`More terms from James A. Sellers (sellersj(AT)math.psu.edu), Dec 13 1999`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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