A026943 a(n) = Sum{(k+1)*T(n,k)}, 0<=k<=n, T given by A026300.

1, 3, 11, 38, 129, 429, 1407, 4563, 14669, 46823, 148587, 469226, 1475669, 4624437, 14447703, 45017082, 139937301, 434093367, 1344076131, 4154688864, 12823246677, 39524238741, 121671304191, 374126377473