A066318
Sequences linked to this entry ?
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A219570: Triangular array read by rows. T(n,k) is the number of necklaces (turning over is not allowed) of n labeled black or white beads having exactly k bla…
match row sums
1, 1 · 1, 2, 1 · 2, 6, 6, 2 · 6, 24, 36, 24, 6 … Σ 0, 2, 4, 16, 96, 768, 7680, 92160, …