# A132839 (b-file synthesized from sequence entry) 0 1 1 5 2 25 3 125 4 625 5 3121 6 15605 7 78025 8 390125 9 1950625 10 9753123 11 48765615 12 243828075 13 1219140375 14 6095701875 15 30478509371 16 152392546855 17 761962734275 18 3809813671375 19 19049068356875 20 95245341784374 21 476226708921870