a（5）=128是具有方块（1638431684364813841643681）的5元组（128178191196209）的起始项。
以下是与前几个术语相对应的方块：
2: 12, 21;
3: 13, 14, 31;
4: 102, 120, 201, 210;
5: 128, 178, 191, 196, 209;
6: 103, 130, 140, 247, 301, 310;
7: 1280, 1780, 1910, 1951, 1960, 2009, 2090;
8: 1003, 1030, 1300, 1400, 2470, 3001, 3010, 3100;
9: 3225, 3750, 4005, 4050, 5004, 5040, 6450, 7080, 7755;
10: 3514, 4396, 4406, 5593, 5909, 6556, 6944, 9013, 9121, 9572;
11: 3774, 5592, 6132, 6432, 6561, 6639, 6858, 6879, 7812, 8568, 8571;
12: 10013, 10031, 10130, 10310, 11003, 11030, 13001, 13010, 30011, 30110, 31001, 31010;
13: 10012, 10021, 10120, 10210, 11002, 11020, 12001, 12010, 14179, 20011, 20110, 21001, 21010;
14: 11153, 11423, 13507, 19532, 19771, 19978, 20468, 21197, 21953, 22318, 28847, 30233, 30512, 31471;
…（结束）
