246297

Appears in sequences

• a(1)=1, a(n)=a(n-1)+n^2 if n odd, a(n)=a(n-1)+ n^4 if n is even.at n=17A140150
• a(n) = 1 + (9960 + (6804 + (2464 + (735 + (175 + (21 + n)*n)*n)*n)*n)*n)*n/5040.at n=17A145129
• a(n) = n*(27*n^3 + 22*n^2 - 21*n - 16)/12.at n=18A172085