a1=0;a2=1;
a3=3·1-4·0+1=4;
a4=3·4-4·1+1=9;
a5=3·9-4·4+1=12;
a6=3·12-4·9+1=1;
a7=3·1-4·12+1= -44.
ответ. а7= -44,7-ой член
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a1=0;a2=1;
a3=3·1-4·0+1=4;
a4=3·4-4·1+1=9;
a5=3·9-4·4+1=12;
a6=3·12-4·9+1=1;
a7=3·1-4·12+1= -44.
ответ. а7= -44,7-ой член