# A006214 (b-file synthesized from sequence entry) 0 0 1 5 2 32 3 178 4 1024 5 6320 6 42272 7 306448 8 2401024 9 20253440 10 183194912 11 1769901568 12 18198049024 13 198465167360 14 2288729963552 15 27831596812288 16 355961301697024 17 4777174607790080 18 67129052143388192 19 985743987073220608 20 15098811288386497024 21 240833888369219993600