A049818 a(n) = Sum_{k=1..n, m=1..n} T(m,k), array T as in A049816.
0, 0, 1, 2, 6, 8, 15, 22, 30, 38, 55, 64, 84, 102, 119, 138, 168, 192, 229, 254, 284, 318, 369, 400, 444, 492, 541, 586, 654, 696, 767, 826, 890, 962, 1029, 1086, 1174, 1256, 1341, 1412, 1518, 1590, 1703, 1792, 1880, 1986, 2117
Offset: 1