# A157314 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 16 5 62 6 298 7 1700 8 11448 9 88622 10 778532 11 7636888 12 82782697 13 981775224 14 12643542295 15 175638751080 16 2617558335383 17 41650633309937 18 704712768652527 19 12632584581030449 20 239150363847113653 21 4767657035201958150