1467067

Appears in sequences

• a(n) = T(n,m) + T(n,m+1) + ... + T(n,n), m=[ (n+1)/2 ], T given by A026758.at n=20A026880
• G.f.: 1 / sqrt( AGM((1 - 3*x)^2, (1 + x)^2) ).at n=17A245931