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A331636
Number of nonnegative integer matrices with nonzero rows, total sum n and columns with equal sums.
2
1, 5, 17, 109, 557, 5785, 47357, 596365, 7151841, 106763725, 1622633597, 28757539337, 526858352477, 10758375762109, 230342261913169, 5344946955452877, 130370767029201437, 3394996816992588345, 92801587319328673277, 2681375183085608280093
OFFSET
1,2
LINKS
FORMULA
a(n) = Sum_{d|n} A316674(n/d, d).
EXAMPLE
The a(2) = 5 matrices are:
[1] [1 0] [0 1] [2] [1 1]
[1] [0 1] [1 0]
CROSSREFS
Cf. A316674.
Sequence in context: A100301 A084167 A267143 * A234797 A062586 A301641
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Jan 23 2020
STATUS
approved