# A078284 (b-file synthesized from sequence entry) 1 1 2 5 3 34 4 253 5 2024 6 16867 7 144575 8 1265032 9 11235584 10 101120256 11 919272960 12 8342666880 13 77009232720 14 715008573240 15 6667341335024 16 62500632501585 17 588241236472080 18 5555611677791867 19 52632110631712424 20 500005051001268028