18536

Appears in sequences

• High temperature series for spin-1/2 Ising magnetic susceptibility on 4D simple cubic lattice.at n=5A010556
• Numbers k such that k | 7^k + 7.at n=28A015893
• a(n) = T(2n+1,n), array T as in A055818.at n=6A055825
• Diagonal of array A085205.at n=17A085228
• a(1) = 0, a(2) = 1, a(3) = 1, a(4) = 7; thereafter, a(n) = a(n-1) + (n-1)*a(n-2).at n=10A086828
• Numbers k such that 7*R_k + 2 is prime, where R_k = 11...1 is the repunit (A002275) of length k.at n=9A098089
• Triangular array read by rows: T(n,1) = T(n,n) = 1, T(n,k) = 4*T(n-1, k-1) + 2*T(n-1, k).at n=32A119726
• Number of partitions of n with odd crank.at n=40A124228
• a(n) = 686*n + 14.at n=26A157366
• Triangle read by rows, arising in enumeration of permutations by cyclic valleys, cycles and fixed points.at n=14A216964
• Triangle read by rows, related to Bell numbers A000110: A216962 interlaced with A216964.at n=31A217204
• Numbers m such that the GCD of the x's that satisfy sigma(x) = m is 4.at n=17A241649
• Numbers k such that card({x|sigma(x)=k}) > 1 and (Sum_{sigma(x)=k} x) < k.at n=20A258931
• Even 14-gonal (or tetradecagonal) numbers.at n=28A270704
• Number of integer compositions of n with all prime parts and all prime run-lengths.at n=54A353429
• a(n) = (2*n^3 - 6*n^2 + 19*n - 9)*n/6.at n=15A378023
• Square array A(n,k), n >= 0, k >= 0, read by antidiagonals downwards, where column k is the expansion of B(x)^k, where B(x) is the g.f. of A120971.at n=60A381602