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http://www.svengato.com/sixj.html

If you try it, you may find trouble reading the square root

sign. It looked like a vertical bar to my browser.

But you can tell it is the sq.rt. because of what the numbers are.

I like the commonality of things that are online

You don't have to have Mathematica on your computer

for this, anyone in the world can calculate a 6j symbol.

Baez and friends have been calculating spinfoam amplitudes

getting from one geometry to another just as

one calculates feynman diagram amplitudes of some

process. The calculations are reminiscent and depend on

some computer whiz discovering an efficient algorithm

to calculate "10j" symbols. Aiiieeee!

A recent paper based on calculating foams using 10j symbols

is

Baez et al "Spin foam models of Riemannian Quantum Gravity"

arxiv:gr-qc/0202017

have to go