25382

Appears in sequences

• a(n) = [ a(n-1)/a(1) ] + [ a(n-3)/a(3) ] + [ a(n-5)/a(5) ] + ..., for n >= 3.at n=33A022866
• Number of regions in regular n-gon which are quadrilaterals (4-gons) when all its diagonals are drawn.at n=33A067151
• a(n) = 7*a(n-1) -14*a(n-2) +7*a(n-3), with a(0)=1, a(1)=2, a(2)=7.at n=8A215143
• a(n) = n*(n^2 + 3)/2.at n=37A229183
• Number of (n+2) X (6+2) 0..3 arrays with every consecutive three elements in every row and column having exactly two distinct values, and in every diagonal and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order.at n=6A252693
• Number of (n+2) X (7+2) 0..3 arrays with every consecutive three elements in every row and column having exactly two distinct values, and in every diagonal and antidiagonal not having exactly two distinct values, and new values 0 upwards introduced in row major order.at n=5A252694
• Number of integers in n-th generation of tree T(-1/4) defined in Comments.at n=39A274149
• Expansion of Product_{k>=1} 1/(1 - x^k)^A007434(k).at n=12A301875
• a(n) = (1/3^n) * Sum_{k=0..n^3} ( (binomial(n^3, k) * 2^k) (mod 3^n) ).at n=36A376536