求通项公式

王守恩

求通项公式。

{0, 1, 0, 1, 2, 1, 2, 1, 2, 4, 2, 4, 2, 4, 2, 4, 6, 4, 6, 4, 6, 4, 6, 4, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 6, 9, 12, 9, 12, 9, 12, 9, 12, 9, 12, 9, 12, 9, 12, 16, 12, 16, 12, 16, 12, 16, 12, 16, 12,
16, 12, 16, 12, 16, 20, 16, 20, 16, 20, 16, 20, 16, 20, 16, 20, 16, 20, 16, 20, 16, 20, 25, 20, 25, 20, 25, 20, 25, 20, 25, 20, 25, 20, 25, 20, 25, 20, 25, 20, 25, 30, 25, 30, 25,
30, 25, 30, 25, 30, 25, 30, 25, 30, 25, 30, 25, 30, 25, 30, 25, 30, 36, 30, 36, 30, 36, 30, 36, 30, 36, 30, 36, 30, 36, 30, 36, 30, 36, 30, 36, 30, 36, 30, 36, 42, 36, 42, 36, 42,
36, 42, 36, 42, 36, 42, 36, 42, 36, 42, 36, 42, 36, 42, 36, 42, 36, 42, 36, 42, 49, 42, 49, 42, 49, 42, 49, 42, 49, 42, 49, 42, 49, 42, 49, 42, 49, 42, 49, 42, 49, 42, 49, 42, 49,
42, 49, 56, 49, 56, 49, 56, 49, 56, 49, 56, 49, 56, 49, 56, 49, 56, 49, 56, 49, 56, 49, 56, 49, 56, 49, 56, 49, 56, 49, 56, 64, 56, 64, 56, 64, 56, 64, 56, 64, 56, 64, 56, 64,......,

0有2个。1有4个。2有6个。4有8个。6有10个。9有12个。12有14个。16有16个。20有18个。25有20个。30有22个。36有24个。42有26个。49有28个。56有30个。64有32个。