# A104779 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 7 4 21 5 57 6 182 7 565 8 1931 9 6670 10 24537 11 92337 12 364602 13 1477148 14 6219031 15 26875932 16 119930947 17 548688443 18 2580814003 19 12425175838 20 61302331782 21 309055818656