55593

Appears in sequences

• a(n) = Sum_{k=0..n-1} T(n,k) * T(n,2n-k), with T given by A027023.at n=8A027042
• a(n) = floor(a(n-1)/2) + a(n-2) with a(0)=1, a(1)=2.at n=44A064650
• Partial sums of A000016.at n=20A133670
• 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, 0), (-1, 0, -1), (-1, 0, 1), (-1, 1, 1), (1, 0, 0)}.at n=11A148550
• Number of compositions of n with exactly three descents.at n=9A241628
• Number of n X 2 nonnegative integer arrays with upper left 0 and every value within 3 of its city block distance from the upper left and every value increasing by 0 or 1 with every step right or down.at n=15A252822