20646

Appears in sequences

• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite MOR = Mordenite Na8[Al8Si40O96].24H2O starting with a T4 atom.at n=13A019182
• Cycle class sequence c(n) (the number of true cycles of length n in which a certain node is included) for zeolite NON = Nonasil-[ 4158 ] [Si88O176].4R starting with a T3 atom.at n=13A019213
• Positive numbers k such that k and 3*k are anagrams in base 7 (written in base 7).at n=31A023069
• Number of bracelets of length n using a maximum of six different colored beads.at n=6A056341
• Number of ways to color vertices of a heptagon using <= n colors, allowing rotations and reflections.at n=6A060532
• Triangle T(n,k) read by rows, giving number of bracelets (turnover necklaces) with n beads of k colors (n >= 1, 1 <= k <= n).at n=26A081720
• First row of infinite array A(j,k): A(j,1) = j-1; A(1,k) = A(2,k-1); for j, k > 1, A(j,k) = A(j-1,k) - A(j+1,k-1) if that number is positive and not already in column k, A(j,k) = A(j-1,k) + A(j+1,k-1) otherwise.at n=19A140985
• Number of n X 3 1..3 arrays containing at least one of each value, all equal values connected, and rows considered as a single number in nondecreasing order.at n=6A166782
• G.f. for Ehrhart quasi-polynomials for hyperplane arrangements of type E_8.at n=55A210632