A065232 Fill a triangular array by rows by writing numbers 1 up to b(0), 1 up to b(1), etc., where b(n) are the octagonal numbers. The first elements of the rows form a(n).

1, 1, 3, 6, 2, 7, 13, 20, 7, 16, 26, 37, 9, 22, 36, 51, 2, 19, 37, 56, 76, 1, 23, 46, 70, 95, 121, 15, 43, 72, 102, 133, 165, 22, 56, 91, 127, 164, 202, 16, 56, 97, 139, 182, 226, 271, 37, 84, 132, 181, 231, 282, 334, 46, 100, 155, 211, 268, 326, 385, 37, 98, 160