# A012052 (b-file synthesized from sequence entry) 0 1 1 0 2 -4 3 -136 4 -7408 5 -644416 6 -84562880 7 -15811723136 8 -4005496370944 9 -1317763889887232 10 -544096638435718144 11 -274416039275290634240 12 -165481485047921126273024 13 -117299354914466636092850176