# A162359 (b-file synthesized from sequence entry) 0 1 1 20 2 209 3 1520 4 8644 5 40944 6 168035 7 613756 8 2034120 9 6206596 10 17632836 11 47062620 12 118870650 13 285840940 14 657667521 15 1454009144 16 3100176535 17 6394814820 18 12796122680 19 24898749084 20 47210910669 21 87394933080