# A012642 (b-file synthesized from sequence entry) 0 1 1 -2 2 -32 3 152 4 48448 5 289408 6 -393649024 7 -34249082624 8 12871254335488 9 2591959365570560 10 -694262452828553216 11 -534293242711984668672 12 97599429997759939117056 13 140451121892184627503628288