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Search: id:A125116
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| A125116 |
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Number of 8 X 8 pandiagonal Franklin squares with magic sum 4n. |
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+0
1
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| 1, 32, 417, 3072, 15585, 60960, 197057, 550912, 1374273, 3127840, 6602849, 13089792, 24605217, 44188704, 76283265, 127213568, 205777537, 323968032, 497842465, 748559360, 1103602017, 1598210592, 2277045057, 3196102656
(list; graph; listen)
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OFFSET
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0,2
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LINKS
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M. M. Ahmed, Algebraic Combinatorics of Magic Squares, math.CO/0405476.
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FORMULA
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a(n)=s^8/2293760+s^7/71680+s^6/3840+s^5/320+s^4/40+2s^3/15+197s^2/420+106s/105+1 where s=4n [Ahmed].
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MAPLE
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a := proc(n) local s ; s :=4*n ; s^8/2293760+s^7/71680+s^6/3840+s^5/320+s^4/40+2*s^3/15+197*s^2/420+106*s/105+1 ; end: for n from 0 to 30 do printf("%d ", a(n)) ; od;
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CROSSREFS
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Sequence in context: A068548 A061594 A145403 this_sequence A145217 A125444 A022692
Adjacent sequences: A125113 A125114 A125115 this_sequence A125117 A125118 A125119
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KEYWORD
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easy,nonn
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AUTHOR
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R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Jan 25 2007
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