89238

Appears in sequences

• a(n) = a(n-1) + a(n-3) + a(n-5).at n=24A122115
• Triangle A124029 with the (0,0) entry replaced by 4.at n=38A123966
• 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=38A124029
• a(n) = 121*n^2 - 204*n + 86.at n=27A157440
• Riordan array (1/(1+4x+x^2), x/(1+4x+x^2)).at n=38A159764
• Triangle of coefficients of Chebyshev's S(n,x+4) polynomials (exponents of x in increasing order).at n=38A207823
• Numbers n such that the difference between the greatest prime divisor of n^2 + 1 and the sum of the other distinct prime divisors is equal to +-1.at n=15A244194
• Triangle read by rows: T(n,k) is the number of words over alphabet {0,1,2,3} having exactly k occurrences of the string 01, where n>=0 and k>=0.at n=32A261711