# A367884 (b-file synthesized from sequence entry) 0 1 1 0 2 6 3 27 4 432 5 5670 6 107892 7 2245320 8 55380672 9 1525511232 10 47089609200 11 1600308206640 12 59508149907456 13 2400782506705440 14 104471929620067968 15 4876509369382166880 16 243046385420037166080 17 12881279635221755358720 18 723372722620484975659008