171097

Appears in sequences

• Sequence defined by the recurrence formula a(n+1)=sum(a(p)*a(n-p)+k,p=0..n)+l for n>=1, with here a(0)=1, a(1)=3, k=1 and l=-1.at n=9A176829
• a(n) = hypergeom([-n, n - 1/2], [1], -4).at n=5A299506
• Rectangular array A(n, k) = hypergeom([-k, k + n/2 - 1], [1], -4) with row n >= 0 and k >= 0, read by ascending antidiagonals.at n=26A300945
• a(n) = Sum_{j=1..n} Sum_{k=1..n} phi(j*k).at n=34A372633