29213

Appears in sequences

• Number of perfect matchings in graph P_{2} X C_{5} X P_{n}.at n=3A028457
• Number of perfect matchings in graph P_{3} X C_{5} X P_{2n}.at n=1A028462
• Expansion of (1-x)*(1+x)/(1-2*x-x^2+x^3).at n=13A052534
• Sums of squares of primitive roots of primes.at n=17A089453
• a(n) = 2a(n-1) + a(n-2) - a(n-3); a(0)=4, a(1)=9, a(2)=20.at n=11A109110
• Let i be in {1,2,3}, let r >= 0 be an integer and n=2*r+i-1. Then a(n)=a(2*r+i-1) gives the quantity of H_(7,2,0) tiles in a subdivided H_(7,i,r) tile after linear scaling by the factor x^r, where x=sqrt((2*cos(Pi/7))^2-1).at n=29A187069
• Partial sums of A299896.at n=39A299897
• Number of integer partitions of n with non-integer median of 0-prepended first differences.at n=51A360691