# A148805 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 8 4 26 5 83 6 289 7 999 8 3600 9 12955 10 47849 11 176552 12 661939 13 2482659 14 9412263 15 35707725 16 136454697 17 521967439 18 2007069109 19 7725358220 20 29848113425 21 115440484663 22 447751809956 23 1738330224040 24 6763528650892 25 26339260716779 26 102749051187162 27 401150111109149 28 1568301977278095