A209447 - cp's OEIS frontend

A209447 a(n) = Pell(n)*A008653(n) for n>=1, with a(0)=1, where A008653 is the theta series of direct sum of 2 copies of hexagonal lattice.

n	a(n)
0	1
1	12
2	72
3	60
4	1008
5	2088
6	2520
7	16224
8	73440
9	11820
10	513648
11	826704
12	1164240
13	5621448
14	23265216
15	14041800
16	175149504
17	245524824
18	98791560
19	1590026160
20	8061191712
21	3706940640
22	40272058656
23	64816900128
24	97801149600
25	487966581012
26	1596075244848
27	91744440540

[1, 12, 72, 60, 1008, 2088, 2520, 16224, 73440, 11820, 513648, 826704, 1164240, 5621448, 23265216, 14041800, 175149504, 245524824, 98791560, 1590026160, 8061191712, 3706940640, 40272058656, 64816900128, 97801149600, 487966581012, 1596075244848, 91744440540]

cp's OEIS Frontend

A209447 a(n) = Pell(n)*A008653(n) for n>=1, with a(0)=1, where A008653 is the theta series of direct sum of 2 copies of hexagonal lattice.

Table of values

List of values