# A309087 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 18 4 50 5 143 6 397 7 1088 8 2973 9 8093 10 22014 11 59861 12 162742 13 442396 14 1202589 15 3268996 16 8886090 17 24154933 18 65659949 19 178482278 20 485165168 21 1318815708 22 3584912818 23 9744803414 24 26489122097 25 72004899306 26 195729609397 27 532048240570 28 1446257064252