# A307307 (b-file synthesized from sequence entry) 1 0 2 10 3 30 4 112 5 300 6 840 7 2044 8 4864 9 10944 10 23960 11 50908 12 105840 13 215748 14 432656 15 855240 16 1669568 17 3223404 18 6162552 19 11678540 20 21957440 21 40988976 22 76019944 23 140155100 24 256995936 25 468887700 26 851538064 27 1539858168 28 2773522192 29 4977094956 30 8900629800