# A056460 (b-file synthesized from sequence entry) 1 4 2 0 3 12 4 12 5 60 6 48 7 252 8 240 9 1008 10 960 11 4092 12 4020 13 16380 14 16128 15 65460 16 65280 17 262140 18 261072 19 1048572 20 1047540 21 4194036 22 4190208 23 16777212 24 16772880 25 67108800 26 67092480 27 268434432 28 268419060 29 1073741820 30 1073675280 31 4294967292 32 4294901760 33 17179865076 34 17179607040 35 68719476420