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G.f.（t^48+2*t^47+2*t ^46+2*t^45+2*t ^44+2*t1^43+2*+
2*t^40+2*t^39+2*t|38+2*t*37+2*t#36+2*t$35+2*t#14+2*t=33+
2*t^32+2*t^31+2*t|30+2*t*29+2*t$28+2*t=27+2*t~26+2*t_25+
2*t^24+2*t^23+2*t|22+2*t*21+2*t$20+2*t*19+2*t$18+2*t=17+
2*t^16+2*t^15+2*t*14+2*t=13+2*t=12+2*t_11+2*t~10+2*t_9+
2*t^8+2*t^7+2*t|6+2*t$5+2*t*4+2*t#3+2*t#2+2*t+
1） /（21*t^48-6*t^47-6*t1^46-6*t ^45-6*t^44-6*t ^43-6*t ^42-
6*t^41-6*t^40-6*t^39-6*t^38-6*t^37-6*t ^36-6*t ^35-6*t1^34-
6*t^33-6*t^32-6*t^31-6*t*30-6*t ^29-6*t ^28-6*t1^27-6*t*26-
6*t^25-6*t^24-6*t^23-6*t*22-6*t ^21-6*t ^20-6*t^19-6*t18-
6*t^17-6*t^16-6*t^15-6*t*14-6*t*13-6*t|12-6*t|11-6*t*10-
6*t^9-6*t^8-6*t^7-6*t|6-6*t|5-6*t*4-6*t*3-6*t#2-6*t+1）
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