A050531 - OEIS

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A050531

Number of multigraphs with loops on 3 nodes with n edges.

1, 2, 6, 14, 28, 52, 93, 152, 242, 370, 546, 784, 1103, 1512, 2040, 2706, 3534, 4554, 5803, 7304, 9108, 11252, 13780, 16744, 20205, 24206, 28826, 34126, 40176, 47056, 54857, 63648, 73542, 84630, 97014, 110808, 126139, 143108, 161868, 182546 (list; graph; refs; listen; history; internal format)

	OFFSET	`0,2`
	FORMULA	`G.f.: (x^6+x^4+2x^3+x^2+1)/((x^3-1)^2(x^2-1)^2*(x-1)^2).`
	CROSSREFS	`Cf. A002620.` `Sequence in context: A121968 A161212 A033547 * A027083 A169948 A192705` `Adjacent sequences: A050528 A050529 A050530 * A050532 A050533 A050534`
	KEYWORD	`easy,nonn`
	AUTHOR	`Vladeta Jovovic (vladeta(AT)eunet.rs), Dec 29 1999`

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Last modified February 14 16:22 EST 2012. Contains 205635 sequences.