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A321567
Expansion of Product_{1 <= i_1 <= i_2 <= i_3 <= i_4} (1 + x^(i_1*i_2*i_3*i_4)).
3
1, 1, 1, 2, 3, 4, 6, 8, 11, 16, 21, 27, 38, 49, 63, 84, 109, 138, 180, 228, 289, 369, 463, 578, 732, 911, 1128, 1407, 1741, 2140, 2646, 3243, 3967, 4861, 5924, 7196, 8767, 10616, 12827, 15516, 18707, 22486, 27054, 32440, 38835, 46488, 55502, 66136, 78836, 93727, 111265
OFFSET
0,4
LINKS
FORMULA
G.f.: Product_{k>0} (1 + x^k)^A218320(k).
CROSSREFS
Product_{1 <= i_1 <= i_2 <= ... <= i_b} (1 + x^(i_1 * i_2 * ... * i_b)): A000009 (b=1), A211856 (b=2), A321359 (b=3), this sequence (b=4).
Sequence in context: A289432 A064660 A321359 * A066806 A271486 A226187
KEYWORD
nonn
AUTHOR
Seiichi Manyama, Nov 13 2018
STATUS
approved