id:A091467 - OEIS Search Results

Search: id:A091467

Displaying 1-1 of 1 results found.

page 1

Table (by antidiagonals) of unlabeled alternating octupi with n black nodes and k white nodes.

+0
4

1, 1, 1, 0, 4, 0, 0, 3, 3, 0, 0, 1, 10, 1, 0, 0, 0, 9, 9, 0, 0, 0, 0, 3, 28, 3, 0, 0, 0, 0, 1, 28, 28, 1, 0, 0, 0, 0, 0, 15, 76, 15, 0, 0, 0, 0, 0, 0, 3, 90, 90, 3, 0, 0, 0, 0, 0, 0, 1, 55, 238, 55, 1, 0, 0, 0, 0, 0, 0, 0, 18, 297, 297, 18, 0, 0, 0, 0, 0, 0, 0, 0, 3, 219, 736, 219, 3, 0, 0, 0, 0, 0 (list; table; graph; listen)

	OFFSET	`1,5`
	REFERENCES	`F. Bergeron, G. Labelle and P. Leroux, Combinatorial Species and Tree-Like Structures, Cambridge, 1998, pg 113 (2.4.41)`
	FORMULA	`G.f.: A(x, y) = Sum_{k>=1} (phi(k)/k)log((1-x^ny^n)^2/(1-x^ny^n(3+x^n+y^n))).`
	EXAMPLE	`1 1 0 0 0 ...` `1 4 3 1 0 ...` `0 3 10 9 3 ...` `0 1 9 28 28 ...` `0 0 3 28 76 ...`
	CROSSREFS	`Main diagonal: A091468. Row sums: A091468. Cf. A091466.` `Sequence in context: A123163 A058305 A020808 this_sequence A050443 A036480 A035639` `Adjacent sequences: A091464 A091465 A091466 this_sequence A091468 A091469 A091470`
	KEYWORD	`nonn,tabl`
	AUTHOR	`Christian G. Bower (bowerc(AT)usa.net), Jan 12 2004`

page 1

Search completed in 0.002 seconds

Last modified December 21 10:15 EST 2009. Contains 171081 sequences.

AT&T Labs Research