# A009248 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 12 4 57 5 332 6 2209 7 16730 8 140609 9 1302664 10 13137441 11 143354574 12 1680017889 13 21043179068 14 280310970385 15 3955899181730 16 58931602709633 17 923925812276752 18 15201851967182913 19 261859798838325270