A047147 T(n,n+2), array T as in A047140.
1, 2, 5, 24, 38, 96, 843, 3840, 12244, 41612, 186870, 785256, 2921302, 10834752, 43743005, 176571744, 684645006, 2630576822, 10387337222, 41267967576, 161904551038, 631554736186, 2485459256832, 9822930677872, 38685615768302
Offset: 0