# A069030 (b-file synthesized from sequence entry) 1 1 2 5 3 25 4 125 5 625 6 15625 7 78125 8 390625 9 1953125 10 9765625 11 30517578125 12 152587890625 13 3814697265625 14 2384185791015625 15 11920928955078125 16 59604644775390625 17 7450580596923828125 18 931322574615478515625 19 4656612873077392578125 20 23283064365386962890625