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A213349
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7-quantum transitions in systems of N >= 7 spin 1/2 particles, in columns by combination indices.
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3
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1, 16, 144, 9, 960, 180, 5280, 1980, 55, 25344, 15840, 1320, 109824, 102960, 17160, 286, 439296, 576576, 160160, 8008, 1647360, 2882880, 1201200, 120120, 1365, 5857280, 13178880, 7687680, 1281280, 43680, 19914752, 56010240
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OFFSET
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7,2
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COMMENTS
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For a general discussion, please see A213343.
This a(n) is for septuple-quantum transitions (q = 7).
It lists the flattened triangle T(7;N,k) with rows N = 7,8,... and columns k = 0..floor((N-7)/2).
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REFERENCES
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LINKS
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FORMULA
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Set q = 7 in: T(q;N,k) = 2^(N-q-2*k)*binomial(N,k)*binomial(N-k,q+k).
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EXAMPLE
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Starting rows of the triangle:
N | k = 0, 1, ..., floor((N-7)/2)
7 | 1
8 | 16
9 | 144 9
10 | 960 180
11 | 5280 1980 55
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MATHEMATICA
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With[{q = 7}, Table[2^(n - q - 2 k)*Binomial[n, k] Binomial[n - k, q + k], {n, q, q + 10}, {k, 0, Floor[(n - q)/2]}]] // Flatten (* Michael De Vlieger, Nov 20 2019 *)
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PROG
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CROSSREFS
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KEYWORD
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nonn,tabf
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AUTHOR
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STATUS
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approved
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