21626

Appears in sequences

• Numbers k such that k^14 == 1 (mod 15^3).at n=25A056087
• a(n) = A078223(n+1)/A078223(n).at n=10A078224
• Third column of A071223.at n=16A087645
• Number of strictly increasing arrangements of 5 nonzero numbers in -(n+3)..(n+3) with sum zero.at n=21A188124
• Number of -2..2 arrays x(0..n+1) of n+2 elements with zero sum and nonzero second differences.at n=5A200547
• T(n,k)=Number of -k..k arrays x(0..n+1) of n+2 elements with zero sum and nonzero second differences.at n=26A200553
• Number of -n..n arrays x(0..7) of 8 elements with zero sum and nonzero second differences.at n=1A200558
• a(n) = n + (n-1)*(n-2) + (n-3)*(n-4)*(n-5) + (n-6)*(n-7)*(n-8)*(n-9) + ... + ...*1.at n=18A239519
• G.f. A(x) satisfies: x = Sum_{n>=1} ((1+x)^n - 1)^n / A(x)^n.at n=5A303654
• Numbers k at which point A336459(k) appears multiplicative, but A051027(k) does not.at n=39A336561
• Number of ways to tile a hexagonal strip made up of n equilateral triangles, using diamonds and trapezoids.at n=33A374391