Data on nsp-spreads (see Steven H. Weintraub, Spreads of nonsingular pairs in symplectic vector spaces, J. Geom. 86 (2006), 165-180.).
Data on generalized continued fractions (see Maxwell Anselm and Steven H. Weintraub, A generalization of continued fractions, J. Number Theory 131 (2011), 2442-2460).