A059295 2-boustrophedon transform (see A059294) of 1, 1, 1, 1, ...
1, 2, 5, 16, 69, 386, 2665, 21856, 207369, 2233346, 26910637, 358654640, 5238083085, 83187634306, 1427274447313, 26308754113344, 518495885082513, 10879652226044546, 242157991346605909, 5698578388375932368, 141364265347273219925, 3686958817004484491522
Offset: 0