# A186097 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 10 4 39 5 147 6 639 7 2857 8 12725 9 58081 10 270250 11 1268444 12 6009439 13 28736727 14 138401100 15 670641714 16 3268021317 17 16004012529 18 78716657052 19 388701645264 20 1926266491659 21 9576792342099 22 47753368809171 23 238759903786041