39540

Appears in sequences

• Maximal planar degree sequences with n nodes.at n=16A007020
• At stage 1, start with a unit square. At each successive stage add 4*(n-1) new squares around outside with edge-to-edge contacts. Sequence gives number of squares (regardless of size) at n-th stage.at n=38A056640
• Numbers in the cycle-attractors of length=14 of the function f(x)=A063919(x).at n=23A097030
• Consider the family of multigraphs enriched by the species of linear order. Sequence gives the triangle read by rows giving coefficients of polynomials arising from enumeration of those multigraphs on n edges, arcs and loops.at n=40A098288
• Structured truncated cubic numbers.at n=19A100152
• a(n) is the number of integers x that can be written x = (2^c(1) - 2^c(2) - 3*2^c(3) - 3^2*2^c(4) - ... - 3^(m-2)*2^c(m) - 3^(m-1)) / 3^m for integers c(1), c(2), ..., c(m) such that n = c(1) > c(2) > ... > c(m) > 0 and c(1) - c(2) != 2 if m >= 2.at n=42A131450
• Number of length 2+2 0..n arrays with the sum of the maximum minus the minimum of adjacent triples multiplied by some arrangement of +-1 equal to zero.at n=18A252178
• Numbers that are members of unitary sigma aliquot cycles (union of unitary perfect, unitary amicable and unitary sociable numbers).at n=41A327157
• Irregular triangle of cycles of purely periodic unitary sigma aliquot sequences with their smallest member as starting number, read by rows.at n=41A336216
• Expansion of g.f. A(x) satisfying 2 = Sum_{n=-oo..+oo} (-1)^n * x^n * (2*A(x) + x^(2*n-1))^(n+1).at n=9A363182