# A047142 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 10 4 38 5 142 6 470 7 1576 8 5940 9 22714 10 83456 11 305088 12 1158606 13 4456076 14 16946498 15 64189932 16 246350606 17 952607962 18 3675557676 19 14158562010 20 54805236890 21 213011072542 22 828185178452 23 3219077811678 24 12537974366478