# A369156 (b-file synthesized from sequence entry) 0 1 1 4 2 22 3 140 4 968 5 7064 6 53544 7 417456 8 3326304 9 26967040 10 221733568 11 1844667136 12 15498804480 13 131325820032 14 1120928667264 15 9628975973120 16 83181462291968 17 722175844640768 18 6297942966129664 19 55143987250677760 20 484589284705202176 21 4272491458636754944