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Search: id:A064141
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| A064141 |
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Sum of non-unitary divisors of central binomial coefficient C(n,[n/2]). |
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+0
1
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| 0, 0, 0, 0, 0, 12, 0, 0, 72, 328, 0, 768, 1344, 4032, 3024, 9072, 0, 36288, 0, 120960, 322560, 967680, 0, 1935360, 6013440, 15966720, 43545600, 104094720, 163296000, 362361600, 149299200, 447897600, 1194393600, 4644864000, 2654208000
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OFFSET
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1,6
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FORMULA
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a(n)=A034448[A001405(n)]
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EXAMPLE
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n=6, C[6,3]=20=4.5, D={1,2,4,5,10,20} of which non-unitary is 2 and 10 with sum=a(6)=12. If n is in A046098 then a(n)=0;
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CROSSREFS
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Cf. A034448, A001405, A046098, A048243.
Sequence in context: A004012 A072837 A023917 this_sequence A048730 A059680 A077351
Adjacent sequences: A064138 A064139 A064140 this_sequence A064142 A064143 A064144
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KEYWORD
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nonn
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AUTHOR
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Labos E. (labos(AT)ana.sote.hu), Sep 11 2001
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