1*0^2 + 2*1^2 + 3*2^2 + 4*3^2 + 5*1^2 = 55.
1*0^2 + 2*1^2 + 3*4^2 + 4*0^2 + 5*1^2 = 55.
1*0^2 + 2*2^2 + 3*3^2 + 4*0^2 + 5*2^2 = 55.
1*0^2 + 2*4^2 + 3*1^2 + 4*0^2 + 5*2^2 = 55.
1*0^2 + 2*5^2 + 3*0^2 + 4*0^2 + 5*1^2 = 55.
1*1^2 + 2*1^2 + 3*1^2 + 4*1^2 + 5*3^2 = 55.
1*1^2 + 2*1^2 + 3*4^2 + 4*1^2 + 5*0^2 = 55.
1*1^2 + 2*3^2 + 3*0^2 + 4*2^2 + 5*2^2 = 55.
1*1^2 + 2*3^2 + 3*0^2 + 4*3^2 + 5*0^2 = 55.
1*1^2 + 2*3^2 + 3*2^2 + 4*1^2 + 5*2^2 = 55.
1*1^2 + 2*3^2 + 3*3^2 + 4*1^2 + 5*1^2 = 55.
1*1^2 + 2*5^2 + 3*0^2 + 4*1^2 + 5*0^2 = 55.
1*2^2 + 2*0^2 + 3*3^2 + 4*1^2 + 5*2^2 = 55.
1*2^2 + 2*1^2 + 3*0^2 + 4*1^2 + 5*3^2 = 55.
1*2^2 + 2*2^2 + 3*3^2 + 4*2^2 + 5*0^2 = 55.
1*2^2 + 2*3^2 + 3*2^2 + 4*2^2 + 5*1^2 = 55.
1*2^2 + 2*4^2 + 3*1^2 + 4*2^2 + 5*0^2 = 55.
1*3^2 + 2*1^2 + 3*1^2 + 4*3^2 + 5*1^2 = 55.
1*3^2 + 2*3^2 + 3*2^2 + 4*2^2 + 5*0^2 = 55.
1*4^2 + 2*0^2 + 3*1^2 + 4*2^2 + 5*2^2 = 55.
1*4^2 + 2*0^2 + 3*1^2 + 4*3^2 + 5*0^2 = 55.
1*4^2 + 2*2^2 + 3*3^2 + 4*1^2 + 5*0^2 = 55.
1*4^2 + 2*3^2 + 3*0^2 + 4*2^2 + 5*1^2 = 55.
1*4^2 + 2*3^2 + 3*2^2 + 4*1^2 + 5*1^2 = 55.
1*4^2 + 2*4^2 + 3*1^2 + 4*1^2 + 5*0^2 = 55.
1*5^2 + 2*1^2 + 3*2^2 + 4*2^2 + 5*0^2 = 55.
1*5^2 + 2*3^2 + 3*1^2 + 4*1^2 + 5*1^2 = 55.
1*5^2 + 2*3^2 + 3*2^2 + 4*0^2 + 5*0^2 = 55.
1*6^2 + 2*0^2 + 3*1^2 + 4*2^2 + 5*0^2 = 55.
1*6^2 + 2*1^2 + 3*2^2 + 4*0^2 + 5*1^2 = 55.
1*7^2 + 2*1^2 + 3*0^2 + 4*1^2 + 5*0^2 = 55.
So a(5) = 31.
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