40545

Appears in sequences

• a(n) = 4*a(n-1) - a(n-2) with a(0) = 0, a(1) = 1.at n=9A001353
• a(n) = 4*a(n-2) - a(n-4) for n > 1, a(n) = n for n = 0, 1.at n=18A002530
• Pisot sequence E(4,15): a(n) = floor(a(n-1)^2/a(n-2)+1/2) for n>1, a(0)=4, a(1)=15.at n=7A010905
• Bisection of A001353. Indices of square numbers which are also octagonal.at n=4A028230
• Numbers k such that k^2 contains every digit at least once.at n=12A054038
• 30 'Reverse and Add' steps are needed to reach a palindrome.at n=15A065319
• Table by antidiagonals of T(n,k)=n*T(n,k-1)-T(n,k-2) starting with T(n,1)=1.at n=69A073134
• a(n) = 1^n + 6^n + 8^n.at n=5A074521
• a(n) = n^3+n for odd n, (n^3+n)*3/2 for even n: Row sums of A093915.at n=29A093917
• a(n) = 2702*a(n-1) - a(n-2); a(-1) = -15; a(0) = 15.at n=2A094836
• a(n) = sum of n-th column in array in A100452.at n=35A100454
• Expansion of (1 + x + x^2)/(1 - 4x^2 + x^4).at n=17A108412
• a(n) = - 4*a(n-2) - a(n-4), a(0) = 1, a(1) = -4, a(2) = -6, a(3) = 15.at n=15A109731
• a(2*n) = A028230(n), a(2*n+1) = -A067900(n+1).at n=8A110294
• a(n) = -14*a(n-1) - a(n-2), with a(1) = a(2) = 1.at n=5A122572
• Triangle A124029 with the (0,0) entry replaced by 4.at n=36A123966
• Center antidiagonal four in a tri-antidiagonal n-th Matrix generated triangular sequence: first element as 4==m[1,1,1].at n=36A124028
• Triangle T(n,k) with the coefficient [x^k] of the characteristic polynomial of the following n X n triangular matrix: 4 on the main diagonal, -1 of the two adjacent subdiagonals, 0 otherwise.at n=36A124029
• a(0) = 1, a(1) = -4, a(n) = -4*a(n-1) - a(n-2) for n > 1.at n=8A125905
• Expansion of x *(1+x) *(x^2+1) *(15*x^4+1) / ( (x^4-2*x^3+2*x^2+2*x+1) *(x^4+2*x^3+2*x^2-2*x+1) ).at n=20A140806