# A012568 (b-file synthesized from sequence entry) 0 1 1 0 2 -20 3 -560 4 -7920 5 1034880 6 172569280 7 12339608320 8 -1902800305920 9 -1037015219466240 10 -208832669083243520 11 24402030281141555200 12 43057075784745711636480 13 18939654540025835056496640