# A012877 (b-file synthesized from sequence entry) 0 1 1 0 2 -1 3 3 4 6 5 -60 6 -120 7 3150 8 -4592 9 -195048 10 1007520 11 18349320 12 -224812632 13 -1637441520 14 47577070632 15 97108316760 16 -12176518106048 17 54434672031488 18 3267323510285952 19 -40295881951639488 20 -953528538620154880