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Number of separable permutations with exactly four occurrences of the 1-box pattern.
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%I #11 Mar 09 2020 05:40:40

%S 0,0,0,0,8,42,178,664,2288

%N Number of separable permutations with exactly four occurrences of the 1-box pattern.

%C See Kitaev-Remmel for precise definition.

%H S. Kitaev and J. Remmel, <a href="http://arxiv.org/abs/1305.6970">The 1-box pattern on pattern avoiding permutations</a>, arXiv preprint arXiv:1305.6970 [math.CO], 2013.

%Y Cf. A229730.

%K nonn,more

%O 0,5

%A _N. J. A. Sloane_, Oct 01 2013