# A012127 (b-file synthesized from sequence entry) 0 1 1 0 2 -4 3 80 4 -2224 5 88960 6 -4942144 7 366928640 8 -35219691264 9 4251941253120 10 -631113275843584 11 113005305852006400 12 -24021321751206703104 13 5979261710118927892480