And: a little correction. The first isn't a variation thereby given: 1 makes 0, zero.

.... and it seems that the sum of digits goes, at least up to 25, like:

1 - 4- 8- 7 - 5 - 1 - 2 - 4 - 6 - 3 and from there: 6 - 3 - 6 - 3 - 6 - 3 - 6 - 3 - 6 - 3 - 6 - 3 - 6 - 3 - 6......

OR:

0 - 3 - 7 - 6 - 4 - 9 - 1 - 3 - 5 - 2 ------- 5 - 2 - 5 - 2 - 5.........

Remark: from the eleventh level the digits start going 6,3,6,3,6,3.... which shows that the series of differing numbers culminates on the tenth level.
In the Fibonacci-order (Which I presented in comparison with the Lo Shu HERE some while ago) it will be seen that this serie reaches it's culmination on the tenth level too with the number for "The sum of the river chart" (see HERE, in the very start) ie 55.
And this sort of leads to a rectification on the sayings that TEN is the number for "The great amplification" (from the ten wings: 1+2+3+4+5+6+7+8+9+10 and no further; Yang: 1+3+5+7+9=25 and Yin: 2+4+6+8+10=30 giving the sum 55).