# A053561 (b-file synthesized from sequence entry) 1 0 2 1 3 2 4 3 5 6 6 15 7 36 8 87 9 234 10 645 11 1782 12 4893 13 13608 14 37994 15 106434 16 299025 17 844182 18 2391723 19 6797196 20 19369708 21 55342972 22 158486625 23 454795398 24 1307534319 25 3765720066 26 10862688116 27 31381118658 28 90780960426 29 262951692390