# A007452 (b-file synthesized from sequence entry) 0 1 1 -1 2 0 3 3 4 -6 5 30 6 0 7 -630 8 2520 9 -22680 10 0 11 1247400 12 -7484400 13 97297200 14 0 15 -10216206000 16 81729648000 17 -1389404016000 18 0 19 237588086736000 20 -2375880867360000 21 49893498214560000 22 0 23 -12623055048283680000