# A027103 (b-file synthesized from sequence entry) 0 1 1 3 2 11 3 41 4 161 5 633 6 2457 7 9415 8 35663 9 133721 10 497025 11 1833499 12 6719707 13 24488183 14 88798775 15 320596441 16 1152996137 17 4132351481 18 14764629473 19 52606224267 20 186963146315 21 662947211163 22 2345810793755 23 8284654896229