# A367415 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 15 5 52 6 198 7 793 8 3255 9 13529 10 56696 11 239340 12 1017900 13 4361840 14 18828606 15 81833505 16 357865215 17 1573549667 18 6952392450 19 30848928525 20 137403484655 21 614104910096 22 2753200345000 23 12378494389660 24 55799811151140 25 252141767612812 26 1141894552992368