# A149834 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 10 4 30 5 94 6 316 7 1112 8 3976 9 14798 10 56508 11 217444 12 856594 13 3430942 14 13813620 15 56463442 16 233440548 17 968955348 18 4064389254 19 17189382700 20 72928723582 21 311804852012 22 1341392988174 23 5785742781494 24 25102210579594 25 109434792302328 26 478132786545494 27 2098665310659574 28 9247115836091400