Date: 2006-04-26 12:39 pm (UTC)
ext_8103: (Default)
From: [identity profile] ewx.livejournal.com
Or observe that f(0)=0 and f(N+1)-f(N) = 4+6N+6N2+4N3 and 6N+6N2 = 3.2.N(N+1) and one of N and N+1 must be even. Induct.
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