Collins Russian Dictionary 2nd Edition © HarperCollins Publishers 2000, 1997:
sequential [sɪˈkwɛnʃəl] adj (process, link etc) после́довательный*после́дователен
sequential access (COMPUT) после́довательный до́ступ
* is used to mark translations which have irregular inflections. The Russian-English side of the dictionary gives inflectional information.