23122

Appears in sequences

• a(0) = 1, a(n) = 20*n^2 + 2 for n>0.at n=34A010010
• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MTT = ZSM-23 Nan[AlnSi24-nO48] starting with a T4 atom.at n=13A019189
• Numerators of continued fraction convergents to sqrt(881).at n=6A042702
• a(n) = 16*a(n-1) - 59*a(n-2) for n > 1; a(0) = 2, a(1) = 21.at n=4A163068
• Expansion of Sum_{i>=1} mu(i)^2*x^i/(1 - x^i) * Product_{j>=i} 1/(1 - mu(j)^2*x^j), where mu() is the Moebius function (A008683).at n=34A284829
• Product_{n>=1} (1 + x^n)^a(n) = g.f. of A005169 (fountains of coins).at n=23A305840