# A007164 (b-file synthesized from sequence entry) 1 1 2 2 3 7 4 31 5 167 6 999 7 6495 8 44619 9 319463 10 2356406 11 17775821 12 136405506 13 1060866006 14 8339982193 15 66147792753 16 528559162227 17 4250413757583 18 34368723106860 19 279254390054538 20 2278795583070154 21 18667432144042678 22 153452484745198722