187427

Appears in sequences

• Tribonacci numbers: a(n) = a(n-1) + a(n-2) + a(n-3) with a(0)=0, a(1)=1, a(2)=0.at n=23A001590
• Consider all quadruples {a,b,c,d} which reach {k,k,k,k} in n steps under map {a,b,c,d}->{|a-b|,|b-c|,|c-d|,|d-a|}; look at max{a,b,c,d}; sequence gives minimal value of this.at n=31A045794
• a(n) = Sum_{k=0..n} T(n, k), array T as in A047080.at n=20A047081
• Minimum value t such that all quadruples of Diffy_length >= n have a maximal value >= t.at n=33A065678
• Expansion of (1-x)/(1+x-x^2+x^3).at n=20A078042
• Expansion of -x^2*(x^9-x^8+2*x^7-x^6+x^5-2*x^4+x^2+1) / ((x^6-x^4+x^2+1) * (x^6+x^4+x^2-1)).at n=46A114952
• Tribonacci sequences A000073 and A001590 interleaved.at n=41A213816
• Numbers of the form t_n or t_n + t_{n+1} where {t_n} are the tribonacci numbers A000073.at n=39A308189