# A030959 (b-file synthesized from sequence entry) 1 1 2 3 3 11 4 44 5 224 6 1345 7 9415 8 75327 9 677949 10 6779490 11 74574400 12 894892802 13 11633606436 14 162870490110 15 2443057351653 16 39088917626459 17 664511599649816 18 11961208793696693 19 227262967080237169 20 4545259341604743382