# A344268 (b-file synthesized from sequence entry) 1 1 2 5 3 25 4 135 5 625 6 3250 7 15625 8 78760 9 390925 10 1956250 11 9765625 12 48847125 13 244140625 14 1220781250 15 6103531250 16 30517977755 17 152587890625 18 762941485875 19 3814697265625 20 19073496178125 21 95367432031250 22 476837207031250 23 2384185791015625 24 11920929201609625 25 59604644775585625 26 298023225097656250