A127498 Secondary diagonal of triangle A127496: a(n) = A127496(n+1,n) for n>=0.
1, 2, 5, 16, 53, 186, 672, 2465, 9158, 34354, 129833, 493534, 1884955, 7227522, 27804584, 107268790, 414852381, 1607836478, 6243201267, 24282747900, 94587991975, 368940451638, 1440796181876, 5632827891526, 22043782012620
Offset: 0