Collatz猜想的登天梯↑、【递降通道】↓、节点入口T_m = (2^2m-1)/3
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T_m = (2^2m-1)/3→2^(2m)↓...2^(2m)↑
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....................T_3 = 21→2^6↓...2^6↑
......................................2^5↓...2^5↑
......................T_2 = 5→2^4↓...2^4↑
......................................2^3↓...2^3↑
......................T_1 = 1→2^2↓...2^2↑
......................................2^1↓...2^1↑
......................................2^0 = 1....↑
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T_m = (2^2m-1)/3→2^(2m)↓...2^(2m)↑
.
.
.
....................T_3 = 21→2^6↓...2^6↑
......................................2^5↓...2^5↑
......................T_2 = 5→2^4↓...2^4↑
......................................2^3↓...2^3↑
......................T_1 = 1→2^2↓...2^2↑
......................................2^1↓...2^1↑
......................................2^0 = 1....↑
