131651

Appears in sequences

• Coefficient of x^4 in (1-x-x^2)^(-n).at n=37A006504
• Number of all possible tetrahedra of any size and orientation, formed when intersecting the original regular tetrahedron by planes parallel to its sides and dividing its edges into n equal parts.at n=37A216173
• a(n) = 2^n + 2*n^2 + 1.at n=17A322593
• Numbers k such that s(k) = s(k+1), where s(k) is A059975.at n=39A327250
• Expansion of Sum_{k>=1} k^4 * x^k/(1 - x^k)^4.at n=18A366933