25984

Appears in sequences

• 9-gonal (or enneagonal) pyramidal numbers: a(n) = n*(n+1)*(7*n-4)/6.at n=28A007584
• Theta series of lattice Kappa_7.at n=31A015236
• Expansion of (1-2*x-x^2)/((1-2*x)*(1-2*x+2*x^2)).at n=11A038508
• Signed double Pochhammer triangle: expansion of x(x-2)(x-4)..(x-2n+2).at n=23A039683
• Numbers n such that 1 - Sum{k=1..n/2} A001223(2k-1)*(-1)^k = 0.at n=18A130643
• Numbers n such that 1 - S(n) = 0, where S(n) = (S(n-1) + A000040(n))*(-1)^n; S(0)=0, n=>1.at n=25A131197
• Number of primes in the open interval between successive tribonacci numbers.at n=24A131354
• Number of binary strings of length n with no substrings equal to 0010 or 0110.at n=18A164402
• Numbers with prime signature {7,1,1}, i.e., of form p^7*q*r with p, q and r distinct primes.at n=34A179696
• Number of n X 2 0..1 arrays with every one equal to some NW, E or S neighbor.at n=9A202900
• Even 9-gonal (nonagonal) pyramidal numbers.at n=20A218329
• Number of minimal dominating sets in the 2 X n king graph.at n=15A286850
• Number of n X 2 0..1 arrays with each 1 adjacent to 1, 3 or 5 king-move neighboring 1s.at n=10A296946
• 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=0A326931
• Numbers that are the sum of four third powers in exactly six ways.at n=34A345149
• a(n) is the smallest n-gonal pyramidal number with exactly n prime factors (counted with multiplicity).at n=6A358865
• Triangle read by rows: g.f. (1 - t)^(-x) * (1 + t)^(2-x).at n=67A371740