A140352 Denominators of Bernoulli twin numbers polynomial coefficients.

1, -2, 1, -3, 1, -6, -2, 2, 1, -30, -2, -2, 1, 1, 30, -6, -1, -3, 2, 1, 42, 6, -2, -3, 1, 1, -42, 6, 2, -6, -2, 2, 2, 1, -30, -6, 3, 6, -3, -2, 6, 1, 1, 30, -10, -3, 1, 3, -5, -3, 1, 2, 1, 66, 10, -2, -1, 1, 5, -1, -1, 1, 1, 1

Offset: 0

Author

Paul Curtz, May 30 2008

Keywords

• sign
• tabf
• frac

Comments

See numerators A140334, when numerator is 0, no entry is entered here.

Examples

			Triangle starts:
1;
-2, 1;
-3, 1;
-6, -2, 2, 1;
		

Crossrefs

Cf. A140351, A129378.

Programs

Mathematica

c[0, x_] = 1; c[n_, x_] := Sum[Binomial[n-1, j-1] BernoulliB[j, x], {j, 1, n}]; Table[CoefficientList[c[n, x], x], {n, 0, 10}] // Flatten // Select[#, # != 0 &]& // Sign[#]*Denominator[#]& (* Jean-François Alcover, Sep 12 2013 *)