# A024874 (b-file synthesized from sequence entry) 2 4 3 6 4 19 5 31 6 70 7 113 8 223 9 361 10 662 11 1071 12 1880 13 3042 14 5194 15 8404 16 14093 17 22803 18 37786 19 61139 20 100509 21 162627 22 265932 23 430287 24 701120 25 1134436 26 1844096 27 2983810 28 4842711 29 7835671 30 12703934 31 20555397 32 33303259 33 53885805 34 87264322 35 141196639 36 228589496