# A216681 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 17 4 85 5 333 6 1883 7 13153 8 76329 9 363033 10 2304867 11 17067553 12 104686957 13 534812789 14 3558451915 15 27086552833 16 170930393745 17 906063493617 18 6183676880195 19 47831931663921 20 307091159448965 21 1664876216837789 22 11545009017568635 23 90248125157828449