# A148400 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 16 5 54 6 197 7 746 8 2876 9 11390 10 45977 11 188066 12 780848 13 3280312 14 13909971 15 59533135 16 256759223 17 1114687983 18 4869337791 19 21385124366 20 94368601473 21 418274225010 22 1861248654027 23 8311998648668 24 37242997500962 25 167375917694208 26 754308894036624 27 3408201201827853 28 15436011804303550