##05AB1E, 10 bytes, George Gibson, A003215
Code:
Ds3*s1+*1+ Explanation:
Computes 3n(n+1)+1 which is the oeis sequence A003215.
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##05AB1E, 10 bytes, George Gibson, A003215
Code:
Ds3*s1+*1+ Explanation:
Computes 3n(n+1)+1 which is the oeis sequence A003215.