18377

Appears in sequences

• a(0) = 1, a(n) = 15*n^2 + 2 for n>0.at n=35A010005
• Values of Newton-Gregory forward interpolating polynomial (1/3)*(n-1)*(2*n+3)*(2*n-1).at n=24A030440
• Numbers k such that gcd(3k,8^k+1) = 3 but k does not divide the numerator of B(2k) (the Bernoulli numbers).at n=27A070193
• Place n points on each of the three sides of a triangle, 3n points in all; a(n) = number of nondegenerate triangles that can be constructed using these points (plus the 3 original vertices) as vertices.at n=15A130748
• Number of reduced words of length n in the Weyl group B_47.at n=3A162191
• Number of reduced words of length n in the Weyl group D_47.at n=3A162456
• Number of strings of numbers x(i=1..6) in 0..n with sum i^2*x(i)^2 equal to n^2*36.at n=33A184244
• Truncated dodecahedron, and truncated icosahedron with faces of centered polygons.at n=8A193248
• Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.at n=2A252405
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.at n=30A252407
• Number of (3+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.at n=5A252410
• G.f. = b(2)^2*b(6)/(x^7+x^6-x^5-x^2-x+1), where b(k) = (1-x^k)/(1-x).at n=17A266335
• Numbers n such that n!3 - 3^7 is prime, where n!3 = n!!! is a triple factorial number (A007661).at n=29A267382
• Nonsemiprimes in A306097 = A121707 \ A267999.at n=23A321488