# A151273 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 11 4 42 5 130 6 506 7 1701 8 6678 9 23348 10 92162 11 330718 12 1310042 13 4785834 14 19002354 15 70329169 16 279708134 17 1045513784 18 4163154786 19 15682361864 20 62502107274 21 236910288210 22 944854095762 23 3599694071586 24 14364065086506 25 54956626517442 26 219388412771714 27 842388119494786 28 3363960168087706