Created
November 30, 2020 17:04
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pe709a.nb
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| In[]:= ClearAll["Global`*"]; | |
| AbsoluteTiming[ | |
| nmax = 24680; | |
| modnum = 1020202009; | |
| dp[0] = 1; dp[1] = 1; | |
| Do[dp[n + 1] = | |
| Mod[PowerMod[n + 1, -1, modnum]*Sum[dp[2 k]*dp[n - 2 k], | |
| {k, 0, Quotient[n, 2]}], modnum], {n, nmax - 1}]; | |
| ans = Mod[dp[nmax]*Mod[nmax!, modnum], modnum]] | |
| Out[]= {215.379, ???} |
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