# A149833 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 10 4 30 5 94 6 309 7 1068 8 3798 9 13854 10 51834 11 197150 12 761151 13 2984766 14 11841509 15 47428821 16 191899909 17 783286480 18 3219622765 19 13325287138 20 55516004988 21 232584392264 22 979365099918 23 4144435559953 24 17617616589605 25 75193307662253 26 322164970730139 27 1385350445979640 28 5977051004543671