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A232628
Denominators of the triangle of polynomial coefficients P(0,x)=1, 2*P(n)=(1+x)*((1+x)^(n-1)+x^(n-1)).
1
1, 1, 1, 2, 2, 1, 2, 2, 1, 1, 2, 1, 1, 2, 1, 2, 2, 1, 1, 1, 1, 2, 1, 2, 1, 2, 2, 1, 2, 2, 2, 2, 2, 2, 1, 1, 2, 1, 1, 1, 1, 1, 1, 2, 1, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 2, 1, 1, 1, 1, 1, 2, 2, 1
OFFSET
0,4
COMMENTS
See A233508.
EXAMPLE
1,
1, 1,
2, 2, 1,
2, 2, 1, 1,
2, 1, 1, 2, 1,
2, 2, 1, 1, 1, 1, etc.
MATHEMATICA
p[n_] := (1+x)*((1+x)^(n-1)+x^(n-1))/2; t[n_, k_] := Coefficient[p[n], x, k] // Denominator; Table[t[n, k], {n, 0, 10 }, {k, 0, n}] // Flatten
CROSSREFS
Cf. A233508 (numerators).
Sequence in context: A334904 A165018 A131837 * A087889 A285110 A323018
KEYWORD
nonn,tabl,frac
AUTHOR
STATUS
approved