# A027088 (b-file synthesized from sequence entry) 1 1 2 3 3 6 4 16 5 41 6 107 7 283 8 757 9 2043 10 5557 11 15216 12 41906 13 115999 14 322537 15 900406 16 2522616 17 7090307 18 19987069 19 56492426 20 160062636 21 454529595 22 1293394325 23 3687475479 24 10531663241 25 30128741717 26 86324342567 27 247691217352