# A215216 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 -6 4 8 5 -36 6 24 7 16 8 -144 9 300 10 -120 11 32 12 -480 13 2040 14 -2640 15 720 16 64 17 -1440 18 10320 19 -27720 20 25200 21 -5040 22 128 23 -4032 24 43680 25 -199920 26 383040 27 -262080 28 40320 29 256 30 -10752 31 163968 32 -1142400 33 3764880 34 -5503680 35 2963520 36 -362880