67991

Appears in sequences

• Alkane (or paraffin) numbers l(7,n).at n=40A005994
• a(n) = n*(n+1)*(2*n^2+1)/6.at n=21A071238
• Number of 0..n arrays x(0..5) of 6 elements without any interior element greater than both neighbors or less than both neighbors.at n=9A200874
• Number of n-element subsets of [n+4] having an even sum.at n=40A282080