# A153983 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 2 4 5 5 11 6 37 7 100 8 493 9 1878 10 13284 11 74395 12 745275 13 5833759 14 83605003 15 936808185 16 19121040653 17 305862769758 18 8892563071671 19 202363258898765 20 8388963351859194 21 272273853161584435 22 16084335957849229172