# A368017 (b-file synthesized from sequence entry) 0 1 1 -2 2 -4 3 14 4 144 5 286 6 -5080 7 -61058 8 -186144 9 4016958 10 73395928 11 468915102 12 -4728823088 13 -167453193314 14 -2051810224568 15 -406640603074 16 533831885402048 17 11987797433266302 18 110763307665075640 19 -1459040819952150178 20 -80503810962755821904