A196472 - cp's OEIS frontend

A196472 a(1)=1; a(n) = floor((3 + sqrt(21))*a(n-1)/2) for n > 1.

n	a(n)
1	1
2	3
3	11
4	41
5	155
6	587
7	2225
8	8435
9	31979
10	121241
11	459659
12	1742699
13	6607073
14	25049315
15	94969163
16	360055433
17	1365073787
18	5175387659
19	19621384337
20	74390315987
21	282035100971
22	1069276250873
23	4053934055531
24	15369630919211
25	58270694924225
26	220920977530307
27	837575017363595

[1, 3, 11, 41, 155, 587, 2225, 8435, 31979, 121241, 459659, 1742699, 6607073, 25049315, 94969163, 360055433, 1365073787, 5175387659, 19621384337, 74390315987, 282035100971, 1069276250873, 4053934055531, 15369630919211, 58270694924225, 220920977530307, 837575017363595]

cp's OEIS Frontend

A196472 a(1)=1; a(n) = floor((3 + sqrt(21))*a(n-1)/2) for n > 1.

Table of values

List of values