# A177774 (b-file synthesized from sequence entry) 1 1 2 1 3 -2 4 12 5 -120 6 1684 7 -31120 8 730167 9 -21231238 10 750298888 11 -31687276404 12 1575667784824 13 -91052587870552 14 6045175643449008 15 -456560323906523200 16 38886167319641201692 17 -3706800668529432678016 18 392824268201002386964776