305235

Appears in sequences

• a(n) = n*(n+1)*(n+2)*(n+3)*(n+4)/8.at n=17A151974
• a(n) = denominator(B°(2*n))/4 where the B°(n) are Zagier's modified Bernoulli numbers.at n=8A216912
• Number of defective 3-colorings of a 2Xn 0..2 array connected horizontally and antidiagonally with exactly two mistakes, and colors introduced in row-major 0..2 order.at n=8A229695
• Number of polygon edges formed when every pair of vertices of a regular n-gon are joined by an infinite line.at n=34A344899
• Number of polygon edges formed when every pair of vertices of a regular (2n-1)-gon are joined by an infinite line.at n=17A344907