25730

Appears in sequences

• a(n) = a(n-2) + a(n-3), with a(0) = 0, a(1) = 1, a(2) = 2.at n=37A007307
• a(n+3) = 5*a(n+2)-4*a(n+1)+a(n).at n=9A012866
• Expansion of (1-2x)/(1-x^2+x^3).at n=36A117363
• a(n) = 3*a(n-1) - 2*a(n-2) + a(n-3), n > 3.at n=12A137584
• a(n) = p(n)*p(n+2) - 3*p(n+1), where p(n) is the n-th prime.at n=36A152528
• a(n) = k, index of A165959(k) at record values.at n=17A230146
• a(n) = a(n-1) + a(n-2) + a(n-4), with a(1)=1, a(2)=1, a(3)=3, a(4)=6.at n=18A259968
• Growth series for group with presentation < S, T : S^3 = T^3 = (S*T)^6 = 1 >.at n=14A298807
• Growth series for group with presentation < S, T : S^2 = T^3 = (S*T)^12 = 1 >.at n=28A299253
• G.f. satisfies A(x) = exp( Sum_{k>=1} (2 * (-1)^k + A(x^k)) * x^k/k ).at n=47A363565