The story
The case r=1 was studied in 1958 by Ralph P. Boas, Jr. and Robert Creighton Buck.
Etymology from Wiktionary, CC BY-SA 4.0.
Boas-Buck polynomial
Today it means: Any member of the sequence of polynomials Φₙ⁽ʳ⁾(x) given by generating functions of the form displaystyle C(ztʳB(t))=∑_(n>0)Φₙ⁽ʳ⁾(z)tⁿ. Full definition →