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A014799
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Squares of odd pentagonal pyramidal numbers.
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5
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1, 5625, 164025, 1399489, 6765201, 23532201, 66015625, 159138225, 342731169, 676572121, 1246160601, 2169230625, 3603000625, 5752160649, 8877596841, 13305853201, 19439330625, 27767223225, 38877191929, 53467775361
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listen;
history;
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internal format)
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OFFSET
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0,2
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LINKS
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FORMULA
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a(n) = (1 + 2*n)^2*(1 + 4*n)^4.
G.f.: (1 + 5618*x + 124671*x^2 + 369404*x^3 + 216463*x^4 + 21042*x^5 + 81*x^6) /(1-x)^7. (End)
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MAPLE
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MATHEMATICA
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PROG
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(GAP) A014799:=List(Filtered(List([0..10^2], n->n^2*(n+1)/2), IsOddInt), i->i^2); # Muniru A Asiru, Oct 09 2017
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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