A247304 Expected value of trace(O)^(2n), where O is a 5 X 5 orthogonal matrix randomly selected according to Haar measure.

1, 3, 15, 105, 945, 10263, 127699, 1751685, 25807445, 401449271, 6519160851, 109656966853, 1899821492925, 33757439931675, 613135175204151, 11352879180474205, 213825919244349885, 4089023317563827335, 79269914519539177315, 1555788699527063688453

Offset: 1

Author

Nathaniel Johnston, Sep 11 2014

Keywords

• nonn

Comments

The corresponding sequences for 2 X 2, 3 X 3, and 4 X 4 matrices are A001700, A099251, and A246860.

This sequence is a bisection of A095922. - Nathaniel Johnston, Nov 03 2014

Links

• MathOverflow, Moments of the trace of orthogonal matrices

Crossrefs

Cf. A001700, A095922, A099251, A246860, A247306.

Programs

Maple

A247304 := proc (n) return (1/2)*integrate(integrate((1-cos(x))*(1-cos(y))*(cos(x)-cos(y))^2*(1+2*cos(x)+2*cos(y))^(2*n), y = 0 .. 2*Pi), x = 0 .. 2*Pi)/Pi^2 end proc; seq(A247304(n), n = 1 .. 20);