A095716 a(n) = integer nearest Pi*a(n-1), where a(0) = 1.

1, 3, 9, 28, 88, 276, 867, 2724, 8558, 26886, 84465, 265355, 833637, 2618948, 8227668, 25847981, 81203827, 255109346, 801449647, 2517828323, 7909990963, 24849969499, 78068481620, 245259368334, 770505029782, 2420612941117