id:A139670 - OEIS Search Results

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Number of symnetric binary matrices with all row sums 4.

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1, 26, 820, 35150, 1944530, 133948836, 11234051976, 1127512146540, 133475706272700 (list; graph; listen)

	OFFSET	`4,2`
	CROSSREFS	`Cf. A000085 (row sums 1), A000986 (row sums 2), A110040 (row sums 3).` `Adjacent sequences: A139667 A139668 A139669 this_sequence A139671 A139672 A139673` `Sequence in context: A094738 A143900 A091742 this_sequence A037138 A091429 A106710`
	KEYWORD	`nonn`
	AUTHOR	`Ron Hardin (rhh(AT)cadence.com), Jun 12 2008`

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Last modified October 13 20:18 EDT 2008. Contains 145016 sequences.