stretch tree of depth 15	 check: 65535
16384	 trees of depth 4	 check: 507904
4096	 trees of depth 6	 check: 520192
1024	 trees of depth 8	 check: 523264
256	 trees of depth 10	 check: 524032
64	 trees of depth 12	 check: 524224
16	 trees of depth 14	 check: 524272
long lived tree of depth 14	 check: 32767