28616

Appears in sequences

• Hit polynomials; convolution of natural numbers with Fibonacci numbers F(2), F(3), F(4), ....at n=18A001891
• Triangle read by rows: T(n,k) = (2^(n+1)-1)*binomial(n,k).at n=39A134346
• Triangle read by rows: T(n,k) = (2^(n+1)-1)*binomial(n,k).at n=41A134346
• Octagonal numbers which are the sums of exactly two positive octagonal numbers.at n=18A136346
• Number of (n+2) X 3 binary arrays avoiding patterns 001 and 110 in rows, columns and nw-to-se diagonals.at n=30A202440
• Number of (n+1) X (4+1) 0..2 arrays with no 2 X 2 subblock having the sum of its diagonal elements greater than the absolute difference of its antidiagonal elements.at n=6A251084
• Number of (n+1) X (7+1) 0..2 arrays with no 2 X 2 subblock having the sum of its diagonal elements greater than the absolute difference of its antidiagonal elements.at n=3A251087
• Numbers k such that card({x|sigma(x)=k}) > 1 and (Sum_{sigma(x)=k} x) < k.at n=34A258931
• G.f.: Sum_{n>=0} x^n * (1 + x^n)^n / (1 - x^(n+1))^(n+1).at n=57A325046
• a(n) is the end square spiral number for a knight starting on square n moving on a board with squares numbered with the square of their distance from the 0-square origin and where the knight moves to the smallest numbered unvisited square; the smallest spiral number ordering is used if the distances are equal.at n=19A326931
• T(n, k) = [x^k] (1/2 - x)^(-n) - (1 - x)^(-n).at n=24A356117
• Number of unlabeled simple graphs covering n vertices with a unique triangle.at n=10A372174