# A012888 (b-file synthesized from sequence entry) 0 0 1 2 2 -1 3 -7 4 18 5 -13 6 135 7 -1614 8 10612 9 -71215 10 637515 11 -6443034 12 67830114 13 -769960735 14 9523596355 15 -126475570464 16 1788373677960 17 -26860585215767 18 427142221117623 19 -7163185240710714 20 126244734481260190