22784

Appears in sequences

• Number of unrooted achiral trees with n nodes.at n=39A003244
• Powers of fifth root of 6 rounded down.at n=28A018129
• Numbers that are the sum of 4 nonzero squares in exactly 7 ways.at n=42A025363
• Numbers k such that the continued fraction for sqrt(k) has even period and if the last term of the periodic part is deleted the central term is 75.at n=39A031573
• Number of partitions satisfying cn(0,5) + cn(2,5) + cn(3,5) < cn(1,5) + cn(4,5).at n=40A039881
• a(n) = T(n,2), array T as in A049600.at n=11A049611
• Triangle of partial row sums (prs) of triangle A055249.at n=55A055252
• Binomial transform of binomial(n+2,2).at n=10A084851
• Number of line segments connecting exactly 9 points in an n x n grid of points.at n=45A177725
• Products of the 8th power of a prime and a distinct prime (p^8*q).at n=23A179668
• Constant term of the reduction by x^2 -> x+1 of the polynomial p(n,x) defined below in Comments.at n=8A192386
• Triangular array: the fusion of (p(n,x)) by (q(n,x)), where p(n,x)=sum{F(k+2)*x^(n-k) : 0<=k<=n}, where F=A000045 (Fibonacci numbers), and q(n,x)=2x*q(n-1,x)+1 with q(0,x)=1.at n=46A193908
• Mirror of the triangle A193908.at n=53A193909
• Integers that are Rhonda numbers to base 30.at n=18A255736
• a(n) = n-th Rhonda number to base b = n-th composite number, cf. A002808.at n=18A255880
• a(n) = (A242804(n)-9)/12.at n=4A257044
• Values of n such that there are exactly 7 solutions to x^2 - y^2 = n with x > y >= 0.at n=35A257414
• Number of subsets of {1, 2, 3, ..., n} that include no consecutive odd integers.at n=17A279245
• Number T(n,k) of colored compositions of n using all colors of a k-set such that all parts have different color patterns and the patterns for parts i are sorted and have i colors (in arbitrary order); triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=25A327673
• Numbers k such that k and k+1 are both phi-practical numbers (A260653).at n=27A330871