# A073968 (b-file synthesized from sequence entry) 1 0 2 0 3 1 4 20 5 125 6 650 7 3150 8 15625 9 78000 10 390625 11 1952500 12 9762500 13 48815625 14 244125000 15 1220703125 16 6103593750 17 30517656250 18 152587890625 19 762939062500 20 3814697265625 21 19073484375000 22 95367421875000 23 476837119140625 24 2384185742187500 25 11920928955078125