A001109 - cp's OEIS frontend

A001109 a(n)^2 is a triangular number: a(n) = 6*a(n-1) - a(n-2) with a(0)=0, a(1)=1.

n	a(n)
0	0
1	1
2	6
3	35
4	204
5	1189
6	6930
7	40391
8	235416
9	1372105
10	7997214
11	46611179
12	271669860
13	1583407981
14	9228778026
15	53789260175
16	313506783024
17	1827251437969
18	10650001844790
19	62072759630771
20	361786555939836
21	2108646576008245
22	12290092900109634
23	71631910824649559
24	417501372047787720

[0, 1, 6, 35, 204, 1189, 6930, 40391, 235416, 1372105, 7997214, 46611179, 271669860, 1583407981, 9228778026, 53789260175, 313506783024, 1827251437969, 10650001844790, 62072759630771, 361786555939836, 2108646576008245, 12290092900109634, 71631910824649559, 417501372047787720]

cp's OEIS Frontend

A001109 a(n)^2 is a triangular number: a(n) = 6*a(n-1) - a(n-2) with a(0)=0, a(1)=1.

Table of values

List of values