# A135410 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 4 4 10 5 26 6 80 7 272 8 1076 9 4848 10 24832 11 142340 12 902440 13 6257264 14 47042924 15 380800060 16 3300070116 17 30472353884 18 298595442140