# A092978 (b-file synthesized from sequence entry) 1 2 2 8 3 16 4 128 5 256 6 3072 7 6144 8 98304 9 196608 10 3932160 11 7864320 12 188743680 13 25165824 14 704643072 15 21139292160 16 676457349120 17 1352914698240 18 48704929136640 19 4638564679680 20 185542587187200 21 7792788661862400