# A180567 (b-file synthesized from sequence entry) 0 0 1 0 2 4 3 18 4 96 5 374 6 1380 7 4696 8 15336 9 48318 10 148448 11 446890 12 1324104 13 3872656 14 11206764 15 32143818 16 91509120 17 258855006 18 728211180 19 2038815272 20 5684262480 21 15789141750 22 43712852544 23 120663667538 24 332191809936 25 912339490464