# A168268 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 2 4 3 5 6 6 20 7 45 8 116 9 385 10 2224 11 6396 12 23708 13 88065 14 445784 15 3962502 16 14478825 17 64495508 18 309085415 19 1608099881 20 10856426344 21 142802148953 22 604464533847 23 3324499738872 24 17795211310951 25 112537384959231 26 718232376832560