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Table 1 Exponential growth rates of k, τ-structures. We have k-noncrossing structures with minimum stack-length greater than or equal to three.

From: Sequence-structure relations of pseudoknot RNA

k 3 4 5 6 7 8 9
τ = 3 2.0348 2.2644 2.4432 2.5932 2.7243 2.8414 2.9480
τ = 4 1.7898 1.9370 2.0488 2.1407 2.2198 2.2896 2.3523
τ = 5 1.6465 1.7532 1.8330 1.8979 1.9532 2.0016 2.0449
τ = 6 1.5515 1.6345 1.6960 1.7457 1.7877 1.8243 1.8569
τ = 7 1.4834 1.5510 1.6008 1.6408 1.6745 1.7038 1.7297
τ = 8 1.4319 1.4888 1.5305 1.5639 1.5919 1.6162 1.6376
τ = 9 1.3915 1.4405 1.4763 1.5049 1.5288 1.5494 1.5677