# A026395 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 10 4 20 5 50 6 100 7 250 8 500 9 1250 10 2500 11 6250 12 12500 13 31250 14 62500 15 156250 16 312500 17 781250 18 1562500 19 3906250 20 7812500 21 19531250 22 39062500 23 97656250 24 195312500 25 488281250 26 976562500 27 2441406250 28 4882812500 29 12207031250