A206523 The pairwise sums of the terms of A004210.
4, 9, 11, 19, 21, 26, 31, 33, 38, 44, 46, 48, 51, 61, 68, 70, 73, 75, 85, 91, 93, 97, 98, 108, 110, 120, 123, 125, 130, 133, 140, 152, 157, 162, 164, 165, 169, 179, 189, 191, 203, 204, 205, 210, 212, 220, 228, 232, 245, 251, 261, 263, 268, 269, 278, 283, 290, 292, 303, 306, 308, 313, 323, 324, 327, 335, 348, 350, 363, 372, 382, 389, 391, 395, 396, 406, 417, 418, 419, 421
Offset: 1