A084603 - cp's OEIS frontend

A084603 Coefficients of 1/sqrt(1 - 2x - 11x^2); also, a(n) is the central coefficient of (1 + x + 3*x^2)^n.

n	a(n)
0	1
1	1
2	7
3	19
4	91
5	331
6	1441
7	5797
8	24739
9	103411
10	441397
11	1876777
12	8047909
13	34533253
14	148803487
15	642228139
16	2778852979
17	12043194163
18	52286516821
19	227323871929
20	989675651041
21	4313712072241
22	18822940658947
23	82215245701519

[1, 1, 7, 19, 91, 331, 1441, 5797, 24739, 103411, 441397, 1876777, 8047909, 34533253, 148803487, 642228139, 2778852979, 12043194163, 52286516821, 227323871929, 989675651041, 4313712072241, 18822940658947, 82215245701519]

cp's OEIS Frontend

A084603 Coefficients of 1/sqrt(1 - 2x - 11x^2); also, a(n) is the central coefficient of (1 + x + 3*x^2)^n.

Table of values

List of values

cp's OEIS Frontend

A084603 Coefficients of 1/sqrt(1 - 2*x - 11*x^2); also, a(n) is the central coefficient of (1 + x + 3*x^2)^n.

Table of values

List of values

A084603 Coefficients of 1/sqrt(1 - 2x - 11x^2); also, a(n) is the central coefficient of (1 + x + 3*x^2)^n.