# A009231 (b-file synthesized from sequence entry) 0 1 1 0 2 2 3 -3 4 24 5 -100 6 760 7 -5271 8 46424 9 -430704 10 4535458 11 -51583675 12 641139356 13 -8578689912 14 123397966718 15 -1895969179755 16 31013379835728 17 -537961001417760 18 9865047642312306 19 -190684789616229651 20 3875088566364987868