# A081070 (b-file synthesized from sequence entry) 0 0 1 5 2 45 3 320 4 2205 5 15125 6 103680 7 710645 8 4870845 9 33385280 10 228826125 11 1568397605 12 10749957120 13 73681302245 14 505019158605 15 3461452808000 16 23725150497405 17 162614600673845 18 1114577054219520 19 7639424778862805