id:A136102 - OEIS Search Results

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Triangle read by rows, in which rows give signatures for Ferrers boards fitting inside staircases coded 1, 2, 12, 360, 75600, ... (see A006939).

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1, 1, 2, 1, 2, 4, 6, 12, 1, 2, 4, 6, 8, 12, 24, 30, 36, 60, 72, 120, 180, 360, 1, 2, 4, 6, 8, 12, 16, 24, 30, 36, 48, 60, 72, 120, 144, 180, 210, 216, 240, 360, 420, 32, 720, 840, 900, 1080, 1260, 1680, 1800, 2160, 2520, 3600, 5040, 5400, 6300, 7560, 10800, 12600 (list; graph; listen)

	OFFSET	`1,3`
	COMMENT	`The number of signatures on each row is 1 2 5 14 42 132 ... cf. A000108.`
	REFERENCES	`G. E. Andrews and K. Eriksson, Integer Partitions, Cambridge Univ. Press, 2004. page 22 Exer. 33.`
	EXAMPLE	`The irregular array begins` `1` `1 2` `1 2 4 6 12` `1 2 4 6 8 12 24 30 36 60 72 120 180 360`
	CROSSREFS	`Cf. A000041 A000108 A006939 A025487.` `Adjacent sequences: A136099 A136100 A136101 this_sequence A136103 A136104 A136105` `Sequence in context: A058553 A112179 A038067 this_sequence A139248 A138380 A016013`
	KEYWORD	`easy,nonn,tabf`
	AUTHOR	`Alford Arnold (Alford1940(AT)aol.com), Jan 12 2008`

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Last modified October 6 16:13 EDT 2008. Contains 144667 sequences.

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