# A316297 (b-file synthesized from sequence entry) 1 1 2 4 3 36 4 288 5 7200 6 14400 7 705600 8 11289600 9 914457600 10 9144576000 11 1106493696000 12 13277924352000 13 2243969215488000 14 31415569016832000 15 471233535252480000 16 15079473128079360000 17 4357967734014935040000 18 26147806404089610240000