# A098657 (b-file synthesized from sequence entry) 0 1 1 1 2 6 3 4 4 40 5 16 6 288 7 64 8 2176 9 256 10 16896 11 1024 12 133120 13 4096 14 1056768 15 16384 16 8421376 17 65536 18 67239936 19 262144 20 537395200 21 1048576 22 4297064448 23 4194304 24 34368126976 25 16777216 26 274911461376 27 67108864 28 2199157473280 29 268435456 30 17592722915328 31 1073741824