Number of length-n restricted growth strings (RGS) with growth <= four and first element in [4].

A306028

Number of length-n restricted growth strings (RGS) with growth <= four and first element in [4].

Terms

    a(0) =1a(1) =4a(2) =26a(3) =214a(4) =2096a(5) =23578a(6) =297692a(7) =4150798a(8) =63148652a(9) =1038505282a(10) =18324165284a(11) =344791676446

External references