25006

Appears in sequences

• Number of partitions of n with equal number of parts congruent to each of 1 and 3 (mod 4).at n=48A035544
• Number of partitions of 2n with equal number of parts congruent to each of 1 and 3 (mod 4).at n=24A035594
• Expansion of (1-x)/(1-x-2*x^3).at n=22A052537
• A Catalan transform of Pell(n+1).at n=8A101850
• Composite numbers, not ending with 0, sharing a 3-digit sequence with some of its prime factors.at n=32A131523
• Numbers k such that k and k^2 use only the digits 0, 2, 3, 5 and 6.at n=49A136888
• 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, -1, -1), (-1, 0, 1), (1, 0, 0), (1, 1, 0), (1, 1, 1)}.at n=7A151210
• Triangle T(n,k) read by rows: coefficients of polynomials P_n(t) defined in Formula section.at n=24A318110
• Expansion of e.g.f. 1 / (2 - exp(x) / (1 - x)).at n=5A328008
• Number of pairwise coprime strict compositions of n, where a singleton is not considered coprime unless it is (1).at n=47A337561
• Expansion of Sum_{k>0} (1/(1 - k*x^k)^2 - 1).at n=21A362683
• a(n) = (n^4-3*n^2+4*n+2)/2.at n=15A387525