22420

Appears in sequences

• Multiplicity of highest weight (or singular) vectors associated with character chi_35 of Monster module.at n=50A034423
• Number of 3-way interactions when 3 subsets of power set on {1..n} are chosen at random; number of Boolean functions of n variables and rank 3 from Post class F(8,inf).at n=5A036240
• At stage 1, start with a unit equilateral equiangular triangle. At each successive stage add 3*(n-1) new triangles around outside with edge-to-edge contacts. Sequence gives number of triangles (regardless of size) at n-th stage.at n=36A064412
• Structured triakis octahedral numbers (vertex structure 4).at n=18A100171
• Heptagonal numbers with only even digits.at n=4A117994
• Least number k > (2n-1) such that (2n-1)^k - 2 is prime, or 0 if no such number exists.at n=5A133856
• Numbers n such that 11^n - 2 is prime.at n=2A133982
• Numbers k such that k and k^2 use only the digits 0, 2, 4, 5 and 6.at n=52A136898
• Coefficients of the sum 1+ x/(1-x) + x^2/(1-x^2) + x^3/ ( (1-x)(1-x^2)) + x^4/ ( (1-x)(1-x^3) ) + x^5/ ( (1-x)(1-x^4) ) + x^5 /((1-x^2)(1-x^3)) + x^6/ ( (1-x)(1-x^2)(1-x^3)) + ...at n=47A178702
• a(n) = 4*a(n-1) - 9*a(n-2), with a(0)=0, a(1)=1.at n=10A190967
• Unmatched value maps: number of n X 2 binary arrays indicating the locations of corresponding elements not equal to any horizontal or vertical neighbor in a random 0..1 n X 2 array.at n=9A218759
• Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the upper median minus the lower median minus the minimum of every 2X2 subblock equal.at n=3A237212
• Number of (n+1)X(4+1) 0..3 arrays with the maximum plus the upper median minus the lower median minus the minimum of every 2X2 subblock equal.at n=0A237215
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the maximum plus the upper median minus the lower median minus the minimum of every 2X2 subblock equal.at n=6A237218
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the maximum plus the upper median minus the lower median minus the minimum of every 2X2 subblock equal.at n=9A237218
• Expansion of (1-q)^k/Product_{j=1..k} (1-q^j) for k=16.at n=16A275644
• a(n) = [q^n] (1 - q)^n / Product_{j=1..n} (1 - q^j).at n=16A281425
• On a spirally numbered square grid, with labels starting at 0, this is the number of the last cell that a (1,n) leaper reaches before getting trapped, or -1 if it never gets trapped.at n=5A323472