stretch tree of depth 19	 check: 1048575
262144	 trees of depth 4	 check: 8126464
65536	 trees of depth 6	 check: 8323072
16384	 trees of depth 8	 check: 8372224
4096	 trees of depth 10	 check: 8384512
1024	 trees of depth 12	 check: 8387584
256	 trees of depth 14	 check: 8388352
64	 trees of depth 16	 check: 8388544
16	 trees of depth 18	 check: 8388592
long lived tree of depth 18	 check: 524287