# A077231 (b-file synthesized from sequence entry) 0 1 1 6 2 240 3 448 4 138240 5 225280 6 402554880 7 1857945600 8 1010722406400 9 301234913280 10 5859811786752 11 55010477998080 12 9141306387333120000 13 7898088718655815680 14 1017975879293416243200 15 161212016644168089600