it's cool just the name is enough to tell you what the encoding is. he didn't mention it in the post but it can be visualized as starting from 0, then zigzaggin

it's cool just the name is enough to tell you what the encoding is. he didn't mention it in the post but it can be visualized as starting from 0, then zigzagging right and left to 1, -1, 2, -2 ... and labelling each point with consecutive natural numbers.