# A012577 (b-file synthesized from sequence entry) 0 1 1 0 2 0 3 0 4 -12 5 60 6 -210 7 1260 8 -11088 9 78624 10 -476520 11 4469520 12 -59173752 13 609811488 14 -4917756480 15 63884751840 16 -1229990362368 17 16261478914944 18 -136911418778304 19 2226347294914944 20 -65132012907161472