Geodesic
On the maximum degrees of the coefficients of the Somos sequences
Dalʹnevostočnyj matematičeskij žurnal, Tome 20 (2020) no. 2, pp. 247-254.

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Elements of the Somos-4, 5, 6, 7 sequences are polynomials in the coefficients. In the paper, we calculate the degrees of these polynomials. 
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M. A. Romanov. On the maximum degrees of the coefficients of the Somos sequences. Dalʹnevostočnyj matematičeskij žurnal, Tome 20 (2020) no. 2, pp. 247-254. http://geodesic.mathdoc.fr/item/DVMG_2020_20_2_a12/

[1] S. Fomin and A. Zelevinsky, “The Laurent Phenomenon”, Adv. Appl. Math., 28 (2002), 119–144 | DOI | MR | Zbl

[2] R. Robinson, “Periodicity of Somos sequences”, Proceedings of the AMS, 116:3 (1992), 613–619 | DOI | MR | Zbl