23085

Appears in sequences

• Number of walks on square lattice.at n=14A005565
• Expansion of 1/(1-81*x)^(1/9), related to 9-factorial numbers A045756.at n=3A035024
• Number of partitions of n into parts not of the form 21k, 21k+6 or 21k-6. Also number of partitions with at most 5 parts of size 1 and differences between parts at distance 9 are greater than 1.at n=39A035984
• Numbers having four 5's in base 8.at n=10A043444
• Odd numbers divisible by exactly 7 primes (counted with multiplicity).at n=23A046320
• Numbers which are sums of two, three and four cubes.at n=28A085337
• Numbers which are sums of two, three, four and also sums of five cubes.at n=27A085338
• a(n) = Sum_{k=0..floor(n/3)} C(n-k,2*k)*3^(n-2*k).at n=8A099783
• Triangle read by rows: expansion of p(x,n)=If[n == 0, 1, (x + 1)^n + 2^(n - 2)*Sum[Binomial[n, m]*x^m*(1 + x^(n - 2*m)), {m, 1, n - 1}]].at n=57A146766
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (0, -1, 1), (1, 0, -1), (1, 1, -1), (1, 1, 0)}.at n=9A148957
• a(n) = 64*n^2 - n.at n=18A157948
• a(n) = 361*n^2 - 19.at n=7A158595
• Palindromic numbers in bases 2 and 8 written in base 10.at n=49A259380
• Sum of squares of numbers less than n that do not divide n.at n=41A276984
• Numbers k such that phi(k) and phi(k+1) are perfect powers (A001597).at n=41A332008
• a(n) is the number of vertices formed by n-secting the angles of a nonagon (enneagon).at n=36A335782
• a(n) = (1/3)*n^5 + (1/2)*n^4 + (1/6)*n^3.at n=9A373561