# A086891 (b-file synthesized from sequence entry) 1 1 2 4 3 8 4 64 5 640 6 2560 7 35840 8 114688 9 688128 10 13762560 11 14417920 12 346030080 13 1799356416 14 2399141888 15 23991418880 16 767725404160 17 2372969431040 18 5695126634496 19 216414812110848 20 221963909857280 21 9322484214005760