A246772 Decimal expansion of 'u', an auxiliary constant associated with the asymptotic number of row-convex polyominoes.

1, 8, 0, 9, 1, 5, 5, 0, 1, 8, 8, 1, 5, 6, 0, 6, 0, 9, 5, 1, 5, 8, 9, 5, 7, 7, 3, 0, 1, 0, 0, 0, 1, 8, 0, 0, 4, 9, 4, 4, 2, 9, 1, 0, 3, 3, 9, 9, 8, 8, 1, 0, 0, 0, 4, 9, 9, 5, 9, 4, 8, 3, 2, 4, 4, 3, 8, 9, 8, 1, 7, 8, 0, 8, 2, 4, 5, 6, 3, 2, 8, 6, 5, 8, 4, 2, 9, 4, 6, 2, 4, 4, 0, 7, 4, 9, 0, 4, 9, 1, 1, 5, 5

Offset

0,2

Links

Table of n, a(n) for n=0..102.

Steven R. Finch, Errata and Addenda to Mathematical Constants. p. 48.

Formula

u = first root of 944*x^3 - 295*x^2 + 28*x - 1.

A001169(n) ~ u*v^n, where v = A246773.

Example

0.180915501881560609515895773010001800494429103399881...

Mathematica

u = Root[944*x^3 - 295*x^2 + 28*x - 1, x, 1]; RealDigits[u, 10, 103] // First

Crossrefs

Cf. A001169, A006958, A067675, A246773.

Sequence in context: A019863 A350747 A243456 * A198820 A138285 A085291

Adjacent sequences: A246769 A246770 A246771 * A246773 A246774 A246775

Keyword

nonn,cons,easy

Author

Jean-François Alcover, Sep 03 2014

Status

approved