

A005880


Theta series of D_4 lattice with respect to edge.
(Formerly M1827)


2



2, 8, 12, 16, 26, 24, 28, 48, 36, 40, 64, 48, 62, 80, 60, 64, 96, 96, 76, 112, 84, 88, 156, 96, 114, 144, 108, 144, 160, 120, 124, 208, 168, 136, 192, 144, 148, 248, 192, 160, 242, 168, 216, 240
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OFFSET

0,1


REFERENCES

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).


LINKS

G. C. Greubel, Table of n, a(n) for n = 0..5000
Index entries for sequences related to D_4 lattice


MATHEMATICA

Table[2 DivisorSigma[1, 2 n + 1], {n, 0, 43}] (* JeanFrançois Alcover, Jul 06 2017 *)


PROG

(PARI) for(n=0, 30, print1(2*sigma(2*n+1), ", ")) \\ G. C. Greubel, Nov 30 2017


CROSSREFS

Equals 2 * A008438.
Sequence in context: A285658 A284802 A067884 * A290608 A303900 A046470
Adjacent sequences: A005877 A005878 A005879 * A005881 A005882 A005883


KEYWORD

nonn


AUTHOR

N. J. A. Sloane


STATUS

approved



