# A318946 (b-file synthesized from sequence entry) 0 0 1 0 2 0 3 1 4 5 5 19 6 64 7 201 8 603 9 1752 10 4973 11 13871 12 38176 13 103985 14 280947 15 754216 16 2014469 17 5358823 18 14209456 19 37580841 20 99188427 21 261360696 22 687777245 23 1808000351 24 4748806720 25 12464634209 26 32699621859 27 85747477576 28 224777691893 29 589072137367 30 1543445353168