# A024744 (b-file synthesized from sequence entry) 1 1 2 3 3 9 4 29 5 93 6 297 7 949 8 3195 9 10701 10 35675 11 118761 12 410949 13 1413385 14 4835421 15 16526241 16 58096283 17 203257713 18 708000147 19 2462308561 20 8753612709 21 30980135637 22 109194529241 23 384438181581 24 1376928356139 25 4914117411565 26 17478861072723