2020
MSU - For Beginners
    https://www.youtube.com/watch?v=GxQGbhjVWWM
Volfson - Combinatorics
    https://www.youtube.com/watch?v=1CaQKPKiMv4
2019
Kiliyanov - Combinatory Quant
    https://vk.com/wall-96783705?offset=20&w=wall-96783705_4706%2Fall
    https://www.youtube.com/watch?v=7RRO4mH6Uxw
2018
Kleiner - Popular Combinatory
    https://www.youtube.com/playlist?list=PLUfHxBkkFMSe_Xdx4Wactpd6G_cPrp-80
2016
GetAClass - Combinatory
    https://www.youtube.com/playlist?list=PLFBCHVQg5AWX5-fsKITXokOsBZG8hvR6d
Kazankin - Combinatory
    https://www.youtube.com/watch?v=PVwmlEWxfB8
2013
Spivak - Pascal Triangle and C
    https://www.youtube.com/watch?v=9rgC5u3vAyc
    https://www.youtube.com/watch?v=SArFoBs5fW4
    https://www.youtube.com/watch?v=W_xWFZjWqnk
    https://www.youtube.com/watch?v=K9iDNXOw8j8