

A288621


Number of step shifted (decimated) sequence structures of length n using an infinite alphabet.


2



1, 2, 4, 11, 18, 117, 162, 1205, 3621, 29271, 68086, 1069614, 2305158, 31825670, 172974370, 1311400891, 5179123522, 113680235941, 324041807958, 6466011855715, 39572612670818, 450671611457619, 2006909406239780, 55745145216877102, 231929517217884081
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