A182845 a(n) = A002865(2*n-1)+A002865(2*n).

1, 3, 6, 11, 20, 35, 58, 96, 154, 242, 375, 573, 861, 1282, 1886, 2745, 3961, 5667, 8038, 11323, 15836, 22001, 30383, 41715, 56953, 77363, 104566, 140668, 188397, 251247, 333689, 441474, 581890, 764215, 1000233, 1304815, 1696717, 2199591, 2843073, 3664312

Offset

1,2

Comments

a(n) is also the length of the n-th "large mirror" of the "mirror" version of the shell model of partitions of A135010.

Links

Nathaniel Johnston, Table of n, a(n) for n = 1..1000

Example

a(1)=0+1=1. a(2)=1+2=3: a(3)=2+4=6. a(4)=4+7=11. a(5)=8+12=20. a(6)=14+21=35.

Crossrefs

Cf. A000041, A002865, A135010. For another version see A182844.

Sequence in context: A297443 A185083 A208851 * A265076 A055417 A018918

Adjacent sequences: A182842 A182843 A182844 * A182846 A182847 A182848

Keyword

nonn,easy

Author

Omar E. Pol, Jan 24 2011

Extensions

Extended by Nathaniel Johnston, May 06 2011

Status

approved