# A053564 (b-file synthesized from sequence entry) 1 0 2 0 3 1 4 3 5 6 6 13 7 36 8 93 9 243 10 645 11 1782 12 4914 13 13608 14 37890 15 106288 16 299025 17 844182 18 2391363 19 6797196 20 19371684 21 55345784 22 158486625 23 454795398 24 1307541690 25 3765720066 26 10862647236 27 31381059609 28 90780960426 29 262951692390