id:A101030 - OEIS Search Results

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Triangle read by rows: T(n,k) = number of functions from an n-element set into but not onto a k-element set.

+0
1

0, 0, 2, 0, 2, 21, 0, 2, 45, 232, 0, 2, 93, 784, 3005, 0, 2, 189, 2536, 13825, 45936, 0, 2, 381, 7984, 61325, 264816, 818503, 0, 2, 765, 24712, 264625, 1488096, 5623681, 16736896, 0, 2, 1533, 75664, 1119005, 8172576, 38025127, 132766208, 387057609, 0 (list; table; graph; listen)

	OFFSET	`0,3`
	FORMULA	`T=A089072-A019538.`
	EXAMPLE	`T(3,3) = #(functions into) - #(functions onto) = 3^3 - 6 = 21`
	CROSSREFS	`Sequence in context: A122496 A077184 A077183 this_sequence A093857 A056949 A012622` `Adjacent sequences: A101027 A101028 A101029 this_sequence A101031 A101032 A101033`
	KEYWORD	`nonn,tabl`
	AUTHOR	`Clark Kimberling (ck6(AT)evansville.edu), Nov 26 2004`

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Last modified November 24 23:16 EST 2009. Contains 167481 sequences.

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