A283327 Number of compatible Parke-Taylor factors for the graph obtained by combining n bubbles with a regular 2-gon.

1, 16, 480, 28416, 2588160, 347996160

Offset

1,2

Links

Table of n, a(n) for n=1..6.

Freddy Cachazo, Humberto Gomez, Computation of Contour Integrals on M_{0,n}, arXiv preprint, 2015. Also JHEP, 2016; doi:10.1007/JHEP04(2016)108. See Table 1.

Crossrefs

Sequence in context: A300256 A239401 A254633 * A185367 A209352 A209392

Adjacent sequences: A283324 A283325 A283326 * A283328 A283329 A283330

Keyword

nonn,more

Author

N. J. A. Sloane, Mar 17 2017

Status

approved