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Search: id:A105073
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| A105073 |
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Define a(1)=0, a(2)=2 then a(n)=3*a(n-1)-a(n-2), a(n+1)=3*a(n)-a(n-1) and a(n+2)=3*a(n+1)-a(n)+2 This sequence is such that 20*(a(n)^2)+20*a(n)+1 = j^2 = a square. |
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+0 1
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| 0, 2, 6, 16, 44, 116, 304, 798, 2090, 5472, 14328, 37512, 98208, 257114, 673134, 1762288, 4613732
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