# A149574 (b-file synthesized from sequence entry) 0 1 1 1 2 5 3 13 4 63 5 203 6 1007 7 3611 8 17981 9 68397 10 341145 11 1350105 12 6740921 13 27424021 14 137005923 15 569013889 16 2843565991 17 11999840845 18 59979114067 19 256350760835 20 1281478284811 21 5534183773599 22 27667000811205 23 120518388346869 24 602535467795435 25 2643882222857753 26 13218582405778545 27 58365699035871815