# A293021 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 24 4 192 5 1880 6 21312 7 266504 8 3469312 9 42094656 10 297625600 11 -8727514752 12 -659406274560 13 -31019532622208 14 -1314656227540992 15 -54314985911216640 16 -2248955319931633664 17 -94369141109824233472 18 -4028982346754921594880 19 -175032005028072692797440