# A202360 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 16 4 144 5 768 6 10560 7 92160 8 1585920 9 21127680 10 419973120 11 7431782400 12 177081569280 13 3923981107200 14 105929096232960 15 2868863206809600 16 87449689674547200 17 2742391916199936000 18 94359281224797388800 19 3356687705428721664000