0,1

This appears for example while integrating the product of the absolute value of H_2(x) exp(-x^2) over the real line, where H_2 is the second Hermite polynomial.

Table of n, a(n) for n=0..81.

R. J. Mathar, Orthogonal linear combinations of Gaussian Type Orbitals, arXiv:physics/9907051, Section VII.

Square root of A135002 and also the ratio A002193 / A019774 .

0.85776388496070679648018...

evalf(sqrt(2/exp(1))) ;

(PARI) sqrt(2/exp(1)) \\ Charles R Greathouse IV, Apr 16 2014

Sequence in context: A085663 A265303 A021925 * A305036 A119812 A153799

Adjacent sequences: A227511 A227512 A227513 * A227515 A227516 A227517

cons,nonn,easy

R. J. Mathar, Jul 14 2013

approved