# A012399 (b-file synthesized from sequence entry) 0 0 1 0 2 2 3 -3 4 0 5 -10 6 -32 7 1596 8 -10080 9 27936 10 -19008 11 -4728240 12 113762880 13 -1378522080 14 12151639680 15 -24566643360 16 -3018767431680 17 84947924490240 18 -1424022331422720 19 18489594521756160 20 -42627235124920320