A025185 a(n) = T(3n,n), where T is the array defined in A025177.

1, 2, 16, 120, 946, 7644, 62832, 522804, 4390056, 37126830, 315770676, 2698179488, 23144461368, 199177780102, 1718891656176, 14869867516812, 128909380154562, 1119623594699610, 9740452802251080, 84865206568065000, 740387260555434996, 6467129226550164474

Offset: 0

Author

Clark Kimberling

Keywords

• nonn

Programs

Maple

A025185 := proc(n)
        A025177(3*n,n) ;
end proc: # R. J. Mathar, Jul 28 2016