id:A064276 - OEIS Search Results

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

+0
3

1, 5, 13, 25, 42, 62, 90, 118, 155, 195, 243, 287, 352, 404, 472, 548, 629, 697, 797, 873, 986, 1094, 1202, 1294, 1443, 1559, 1687, 1823, 1984, 2100, 2296, 2420, 2597, 2769, 2937, 3125, 3366, 3514, 3702, 3906, 4167, 4331, 4611, 4783, 5040, 5320, 5548 (list; graph; listen)

	OFFSET	`0,2`
	FORMULA	`a(n) = (A059306(n)+(n+1)(2n+3))/4.`
	EXAMPLE	`There are 5 binary singular matrices up to row and column permutation:` `[0 0] [1 0] [1 1] [1 0] [1 1]` `[0 0] [0 0] [0 0] [1 0] [1 1].`
	CROSSREFS	`Cf. A059306, A062801, A059976.` `Sequence in context: A099776 A133322 A098483 this_sequence A102724 A114572 A097117` `Adjacent sequences: A064273 A064274 A064275 this_sequence A064277 A064278 A064279`
	KEYWORD	`nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)Eunet.yu), Sep 24 2001`
	EXTENSIONS	`More terms from David Wasserman (wasserma(AT)spawar.navy.mil), Jul 16 2002`

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Last modified September 6 16:04 EDT 2008. Contains 143483 sequences.

AT&T Labs Research