A025188 a(n) = T(2n,n+1), where T is the array defined in A025177.
2, 10, 60, 343, 1968, 11319, 65351, 378690, 2201772, 12839896, 75076505, 440016174, 2584289200, 15206283135, 89625150180, 529040216175, 3127061645796, 18506252646420, 109644576096980, 650280444390382
Offset: 1