# A009216 (b-file synthesized from sequence entry) 0 1 1 1 2 -1 3 -3 4 9 5 17 6 -145 7 21 8 2961 9 -9119 10 -58273 11 530541 12 177177 13 -24815503 14 109736783 15 845196933 16 -11562650847 17 9274089409 18 818943535295 19 -6145817165859 20 -30817061557719 21 818240768280017 22 -3016149953173201 23 -67401109608160779