Adapted from Chapter 5 of 'Saṅgītaratnākara - A Study' by R.Rangaramanuja Ayyangar, 2nd Ed.
Prastāra dissects a tāla or a phrase into its smallest units through graded steps. Saṅkhyā tabulates the number of such steps in a series of horizontal blocks,
runs a commentary.
From the figures in Appendix 4 of the book that lists details of the various prastāra-s, the total number of permutation steps in various prastāra-s may be noted
and tabulated as follows:
19 + 10 + 3 + 1 = 33
Sn = Sn-1 + Sn-2 + Sn-4 + Sn-6