Furthermore, there are exactly 2 l + 1 − 1 {\displaystyle 2^{l+1}-1} nodes contained in the layers up to and including layer l {\displaystyle l} (think of binary arithmetic; 0111...111 = 1000...000 - 1).
Zatim, postoji tačno 2 l + 1 − 1 {\displaystyle 2^{l+1}-1} čvorova sadržanih u slojevima uključujući i sloj l {\displaystyle l} (razmislite o binarnom računanju: 0111...111 = 1000...000 – 1 ).