# A049348 (b-file synthesized from sequence entry) 1 1 2 4 3 10 4 25 5 67 6 172 7 448 8 1165 9 3025 10 7864 11 20434 12 53101 13 137995 14 358600 15 931888 16 2421673 17 6293137 18 16353820 19 42498250 20 110439121 21 286995331 22 745807444 23 1938110800 24 5036519125 25 13088273857 26 34012163632 27 88386542578