31042

Appears in sequences

• a(n) = n*(n+1)*(5*n+1)/6.at n=32A033994
• Number of irreducible polynomials over F_2 of degree at most n.at n=17A062692
• Number of lower triangles of an n X n 0..3 array with each element differing from all of its horizontal and vertical neighbors by one.at n=5A194993
• T(n,k)=Number of lower triangles of an n X n 0..k array with each element differing from all of its horizontal and vertical neighbors by one.at n=33A194998
• Number of lower triangles of a 6 X 6 0..n array with each element differing from all of its horizontal and vertical neighbors by one.at n=2A195002
• Composite squarefree numbers n such that p(i)-8 divides n+8, where p(i) are the prime factors of n.at n=21A225708
• G.f.: 1 + Sum_{n>=1} a(n)*x^n/(1 - x^n) = Product_{n>=1} (1 + x^n)/(1 - x^n).at n=24A300274
• Number of cells in regular n-gon after 2 generations of mitosis.at n=19A349807