# A357243 (b-file synthesized from sequence entry) 0 1 1 1 2 -2 3 6 4 -52 5 540 6 -7608 7 129304 8 -2612608 9 60867360 10 -1608663840 11 47527158624 12 -1552431588288 13 55547889458880 14 -2160724031160576 15 90782738645280000 16 -4097139872604807168 17 197675862365363088384 18 -10153243488783257091072