# A012354 (b-file synthesized from sequence entry) 0 0 1 0 2 2 3 -3 4 16 5 -50 6 560 7 -4116 8 49376 9 -495648 10 6643648 11 -86408080 12 1355660480 13 -21635261856 14 389870008320 15 -7287717739680 16 148738206314496 17 -3175392718618112 18 72630134425104384 19 -1740244201350372864 20 44148745987324567552 21 -1171621057231560284160