# A055560 (b-file synthesized from sequence entry) 1 1 2 2 3 6 4 12 5 17 6 44 7 74 8 139 9 1123 10 1411 11 2101 12 4070 13 11323 14 11472 15 12870 16 16318 17 16853 18 18729 19 52642 20 132619 21 435644 22 446904 23 168566853 24 350096787 25 521037077 26 708609429 27 1121857192 28 1641773578 29 11947307367 30 21633254881 31 75356090494