id:A064363 - OEIS Search Results

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Number of 2 X 2 regular integer matrices with elements from {0,...,n} up to row and column permutation.

+0
1

0, 2, 14, 51, 133, 289, 547, 954, 1546, 2380, 3508, 5005, 6915, 9347, 12353, 16028, 20468, 25790, 32054, 39427, 47965, 57833, 69155, 82082, 96682, 113192, 131720, 152429, 175467, 201075, 229305, 260492, 294700, 332182, 373138, 417751, 466201 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n) = ((n+1)(n^3+3n^2+4*n+1)-A059306(n))/4.`
	EXAMPLE	`There are 2 binary regular matrices up to row and column permutation:` `[1 0] [1 1]` `[0 1] [1 0].`
	CROSSREFS	`Cf. A064276, A059306, A062801, A059976, A039623.` `Sequence in context: A079937 A083102 A056080 this_sequence A067056 A137482 A115027` `Adjacent sequences: A064360 A064361 A064362 this_sequence A064364 A064365 A064366`
	KEYWORD	`nonn,nice,easy`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)Eunet.yu), Sep 25 2001`

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Last modified July 25 07:41 EDT 2008. Contains 142293 sequences.

AT&T Labs Research