A158050 Determinant of power series with alternate signs of gamma matrix with determinant 7!.

5040, -4137840, 99515142720, -1122871063189680, 9688118420572305840, -150299359081533202947840, 1405831144255746621131643120, -18442639987146150894175704882480, 203561673763315319923663885655833920

Offset

0,1

Comments

a(n) = Determinant(A - A^2 + A^3 - A^4 + A^5 - ... - (-1)^n*A^n)

where A is the submatrix A(1..8,1..8) of the matrix with factorial determinant

A= [[1,1,1,1,1,1,...], [1,2,1,2,1,2,...], [1,2,3,1,2,3,...], [1,2,3,4,1,2,...], [1,2,3,4,5,1,...], [1,2,3,4,5,6,...], ...]; note: Determinant A(1..n,1..n) = (n-1)!.

a(n) is even with respect to signs of power of A.

References

G. Balzarotti and P. P. Lava, Le sequenze di numeri interi, Hoepli, 2008

Links

Table of n, a(n) for n=0..8.

Example

a(1) = Determinant(A) = 7! = 5040.

Maple

seq(Determinant(sum(A^i*(-1)^(i-1), i=1..n)), n=1..20);

Crossrefs

Cf. A111490, A158040-A158049.

Sequence in context: A178140 A180369 A053876 * A063411 A008552 A221437

Adjacent sequences: A158047 A158048 A158049 * A158051 A158052 A158053

Keyword

sign

Author

Giorgio Balzarotti & Paolo P. Lava, Mar 11 2009

Status

approved