# A009424 (b-file synthesized from sequence entry) 0 0 1 1 2 -1 3 5 4 -24 5 154 6 -1170 7 10394 8 -105392 9 1201524 10 -15210180 11 211691380 12 -3212711040 13 52801793160 14 -934299180360 15 17708685967400 16 -357960437635200 17 7686847410694800 18 -174756587308650000 19 4193327411934706000