20447

Appears in sequences

• Coordination sequence for alpha-Mn, Position Mn2.at n=37A009951
• a(n) = 4*n^4 + 8*n^3 - 4*n - 1 = (2*n^2 - 1)*(2*n^2 + 4*n + 1).at n=8A057769
• Difference between squares of legs of primitive Pythagorean triangles, sorted (with multiplicity).at n=36A127923
• Row sums of triangle A061312.at n=6A193465
• Number of dominating subsets of the graph G(n) obtained by joining each vertex of the path graph P_{n+1} on n+1 vertices with an additional vertex (the join of K_1 and P_{n+1}).at n=12A213663
• Number of partitions of n in which any two parts differ by at most 9.at n=41A218511
• Expansion of ( -1-2*x+x^2+x^3 ) / (x^2+x-1)^3 .at n=12A261055
• Sum of the smallest parts of the partitions of n into 9 parts.at n=50A326465
• Odd composite integers m such that A004187(m-J(m,45)) == 0 (mod m) and gcd(m,45)=1, where J(m,45) is the Jacobi symbol.at n=37A340099
• Lesser of 2 successive sphenic numbers (k, k+4) sandwiching 3 consecutive nonsquarefree numbers.at n=28A363830