The asymtotics for the Apery Sequence n ----- \ 2 2 ) binomial(n, k) binomial(n + k, k) / ----- k = 0 equals the following / 1/2 1/2 n (3/2) | 3 15 2 0.220043767112643037850689760 (17 + 12 2 ) (1/n) |1 - --- + ------- | 4 n 64 n \ 1/2 1/2 1/2 2057 75 2 62917 2 5439 7148379 163053 2 + ------- - ------- + ---------- - -------- + ----------- - ----------- 2 2 3 3 4 4 4096 n 256 n 262144 n 16384 n 33554432 n 1048576 n 1/2\ 17012457 185652129 2 | - ------------ + --------------| 5 5 | 134217728 n 2147483648 n / Note: The constant in front is a non-rigorous estimate. This took , 5.346, seconds.