# A195458 (b-file synthesized from sequence entry) 1 1 2 1 3 1 4 2 5 4 6 8 7 16 8 32 9 96 10 288 11 864 12 2592 13 7776 14 23328 15 69984 16 279936 17 1119744 18 4478976 19 17915904 20 71663616 21 286654464 22 1146617856 23 4586471424 24 18345885696 25 91729428480 26 458647142400 27 2293235712000 28 11466178560000 29 57330892800000 30 286654464000000