# A148093 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 4 4 10 5 25 6 70 7 212 8 639 9 2000 10 6451 11 21617 12 71791 13 246306 14 858806 15 3031680 16 10707284 17 38611784 18 140802398 19 514700655 20 1893610027 21 7056144208 22 26475930759 23 99365898413 24 375942742181 25 1434074803915 26 5489981644607 27 21037233338679 28 81212735932262 29 315232763329880 30 1225469410310123 31 4774478236859757