107236

Appears in sequences

• Second differences of Catalan numbers A000108.at n=10A026012
• a(n) = T(n, [n/2]), where T is the array defined in A026009.at n=20A026021
• 100000n+1, 100000n+3, 100000n+7, 100000n+9 are all primes.at n=22A064964
• Expansion of (1+x^3*C^4)*C, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.at n=11A071738
• 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, 1, 1), (0, 1, -1), (1, 0, 0)}.at n=12A148163