21276

Appears in sequences

• a(n) = (2*n^3 + 5*n^2 - 17*n)/2.at n=26A162259
• a(n) = 2*binomial(n+4, 4) + n + 4.at n=20A177206
• Sequence related to Kashaev's invariant for the (9,2)-torus knot.at n=4A208732
• a(n) = B(n+3) - 6*B(n+2) + 8*B(n+1)*B(n+1) - B(n), where the B(i) are Bell numbers (A000110).at n=4A225591
• Number of (n+1)X(1+1) 0..2 arrays colored with the maximum plus the upper median plus the lower median minus the minimum of every 2X2 subblock.at n=3A236641
• Number of (n+1)X(4+1) 0..2 arrays colored with the maximum plus the upper median plus the lower median minus the minimum of every 2X2 subblock.at n=0A236644
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays colored with the maximum plus the upper median plus the lower median minus the minimum of every 2X2 subblock.at n=6A236645
• T(n,k)=Number of (n+1)X(k+1) 0..2 arrays colored with the maximum plus the upper median plus the lower median minus the minimum of every 2X2 subblock.at n=9A236645
• Number of length n+6 0..2 arrays with no seven consecutive terms having the maximum of any two terms equal to the minimum of the remaining five terms.at n=6A250053
• T(n,k)=Number of length n+6 0..k arrays with no seven consecutive terms having the maximum of any two terms equal to the minimum of the remaining five terms.at n=34A250059
• Number of length 7+6 0..n arrays with no seven consecutive terms having the maximum of any two terms equal to the minimum of the remaining five terms.at n=1A250066
• Numbers m such that (4^m + 23) / 3 is prime.at n=22A261579
• Convolution of A006068 (inverse of Gray code) with itself: a(n) = Sum_{k=1..n+1} A006068(k) * A006068(1+n-k).at n=45A268721
• Numbers n such that sigma(sigma(n))/sigma(n) > sigma(sigma(m))/sigma(m) for all m < n.at n=24A289124