A086020 - cp's OEIS frontend

A086020 a(n) = Sum_(i=1..n) binomial(i+2,3)^2 [ Sequential sums of the tetragonal numbers or "tetras" (pyramidal, square) raised to power 2 (drawn from the 4th diagonal - left or right - of Pascal's Triangle) ].

n	a(n)
1	1
2	17
3	117
4	517
5	1742
6	4878
7	11934
8	26334
9	53559
10	101959
11	183755
12	316251
13	523276
14	836876
15	1299276
16	1965132
17	2904093
18	4203693
19	5972593
20	8344193
21	11480634
22	15577210
23	20867210
24	27627210
25	36182835
26	46915011
27	60266727
28	76750327

[1, 17, 117, 517, 1742, 4878, 11934, 26334, 53559, 101959, 183755, 316251, 523276, 836876, 1299276, 1965132, 2904093, 4203693, 5972593, 8344193, 11480634, 15577210, 20867210, 27627210, 36182835, 46915011, 60266727, 76750327]

cp's OEIS Frontend

A086020 a(n) = Sum_(i=1..n) binomial(i+2,3)^2 [ Sequential sums of the tetragonal numbers or "tetras" (pyramidal, square) raised to power 2 (drawn from the 4th diagonal - left or right - of Pascal's Triangle) ].

Table of values

List of values