A216640 - cp's OEIS frontend

A216640 Number of nondecreasing arrays of n 1..n integers with the sum of their 2nd powers equal to sum(i^2,i=1..n).

n	a(n)
1	1
2	1
3	1
4	1
5	1
6	3
7	8
8	25
9	83
10	257
11	788
12	2491
13	7885
14	25099
15	80481
16	264505
17	884517
18	2994535
19	10208806
20	35095825
21	121699761
22	424273761
23	1487693075
24	5244197347
25	18584820912
26	66169376686
27	236592018517
28	849466213882
29	3061492852986
30	11072927827447

[1, 1, 1, 1, 1, 3, 8, 25, 83, 257, 788, 2491, 7885, 25099, 80481, 264505, 884517, 2994535, 10208806, 35095825, 121699761, 424273761, 1487693075, 5244197347, 18584820912, 66169376686, 236592018517, 849466213882, 3061492852986, 11072927827447]

cp's OEIS Frontend

A216640 Number of nondecreasing arrays of n 1..n integers with the sum of their 2nd powers equal to sum(i^2,i=1..n).

Table of values

List of values