A191658 Table, by rows, of denominators of alpha-coefficients in the symmetrized product of 2n Dirac matrices with two tensor indices.

1, 2, 3, 6, 3, 45, 4, 3, 9, 45, 315, 120, 9, 9, 45, 135, 315, 14175, 720, 36, 9, 81, 135, 135, 2025, 315, 945, 14175, 467775, 5040, 180, 27, 81, 135, 135, 405, 2025, 945, 945, 14175, 14175, 42525, 467775, 42567525

Offset: 1

Author

Jonathan Vos Post, Jun 10 2011

Keywords

• nonn
• frac
• tabf

Comments

The numerators are A191657. From table 1 by Izaurieta et al.

Examples

			The coefficients corresponding to each partition of 4 are:
1 + 1 + 1 + 1 -> 1/24;
2 + 1 + 1 -> -1/3;
2 + 2 -> 2/9;
3 + 1 -> 32/45;
4 -> -272/315.
		

Links

• Fernando Izaurieta, Ricardo Ramírez, Eduardo Rodríguez, An efficient algorithm for the computation of the trace of the symmetrized product of an arbitrary number of Dirac matrices with two indices, arXiv:1106.1648, June 08 2011.

Crossrefs

Cf. A191657.