26971

Appears in sequences

• a(n) = binomial(n,0) - binomial(n,2) + binomial(n,4).at n=30A058923
• a(n) = n^3 - n + 1.at n=30A061600
• The last number for which a determinant of base-n numbers is nonzero.at n=28A079505
• Number of 0..n arrays x(0..3) of 4 elements without any interior element greater than both neighbors or less than both neighbors.at n=19A200872
• Molien series for invariants of finite Coxeter group A_12.at n=55A266781
• If a(n) is not a square, then a(n+1) = a(n) + a(n-1), else a(n+1) is the smallest positive integer not occurring earlier.at n=31A268133