# A367074 (b-file synthesized from sequence entry) 0 1 1 2 2 0 3 2 4 12 5 24 6 28 7 120 8 480 9 1056 10 2304 11 8448 12 27760 13 69600 14 191232 15 643104 16 1978560 17 5470080 18 16353792 19 52557312 20 159694848 21 468853760 22 1444300800 23 4549644288 24 13905927936 25 42219904512 26 131505807360 27 411672307200 28 1270614647808 29 3928681875456