Natyashastra
चञ्चत्पुटेन योक्तव्यं त्रिमूढं द्विकलेन तु । चतुःषष्टिः सन्निपातास्तस्मिंश्चैव प्रकीर्तिताः ॥ ३१७॥
It should be performed with the Chanchatpuṭa rhythm; the Trimūḍha pattern should be rendered in double time (dvikalena). In it, sixty-four rhythmic combinations (sannipāta) are said to be employed.
english translation
caJcatpuTena yoktavyaM trimUDhaM dvikalena tu । catuHSaSTiH sannipAtAstasmiMzcaiva prakIrtitAH ॥ 317॥
hk transliteration by Sanscript