A221960 - OEIS

A221960

Triangle read by rows giving coefficients of polynomials arising in enumeration of multigraphs.

1, 1, -1, 1, 0, -3, 2, 1, 0, 0, -4, -3, 12, -6, 1, 0, 0, 0, -5, -10, 20, 30, -60, 24, 1, 0, 0, 0, 0, -6, -15, 20, 120, -90, -270, 360, -120

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,6

LINKS

Christian Brouder, William J. Keith, Ângela Mestre, Closed forms for a multigraph enumeration, arXiv preprint arXiv:1301.0874, 2013.

EXAMPLE

Triangle begins

1, -1,

1, 0, -3, 2,

1, 0, 0, -4, -3, 12, -6,

1, 0, 0, 0, -5, -10, 20, 30, -60, 24,

1, 0, 0, 0, 0, -6, -15, 20, 120, -90, -270, 360, -120,

...

CROSSREFS

KEYWORD

sign,tabf,more

AUTHOR

STATUS

approved