20880

Appears in sequences

• Ferromagnetic susceptibility series for f.c.c. lattice.at n=25A002924
• "CHK" (necklace, identity, unlabeled) transform of 1, 2, 3, 4, ...at n=12A032170
• Sums of distinct powers of 12.at n=20A033048
• For all n, if d is recursively applied to a(n) exactly 6 times then the fixed point of d-iteration is just reached.at n=35A036458
• Sums of 2 distinct powers of 12.at n=8A038492
• Related to A000032 (Lucas numbers): (n-1)!*L(n).at n=6A039647
• Jabotinsky-triangle related to A039647.at n=21A039692
• Number of 2n-bead balanced binary strings of fundamental period 2n, rotationally equivalent to reverse, inequivalent to complement and reversed complement.at n=12A045667
• Order of n-th stable homotopy group of spheres.at n=54A048648
• E.g.f. (1-2x)/(1-2x-x^2).at n=6A052580
• Quarter-squared applied twice.at n=34A059403
• a(n) = Fibonacci(n)*(Fibonacci(n) + 1).at n=12A059727
• a(n) = floor(n^4/64).at n=34A060494
• Numbers k such that sigma (x) = k has exactly 12 solutions.at n=24A060676
• Numbers which can be written as b^2*c^2*(b^2+c^2).at n=25A063663
• Numbers k such that core(k) = ceiling(sqrt(k)) where core(k) is the squarefree part of k (the smallest integer such that k*core(k) is a square).at n=11A069187
• a(n) = n^2*(n^2+1).at n=12A071253
• Inverse EULER transform of A064831 (with its initial 1 omitted).at n=13A072337
• Smallest a(n)>a(n-1) such that a(n)^2+a(n-1)^2 is a perfect square, a(1)=6.at n=34A076672
• Smallest a(n)>a(n-1) such that a(n)^2+a(n-1)^2 is a perfect square, a(1)=7.at n=30A076673