a(n) is the number of words of length n over the alphabet [n], avoiding 120 and 210, and sortable by a stack of depth 2.
A369325
a(n) is the number of words of length n over the alphabet [n], avoiding 120 and 210, and sortable by a stack of depth 2.
Terms
- a(0) =0a(1) =1a(2) =4a(3) =25a(4) =176a(5) =1281a(6) =9472a(7) =70785a(8) =533248a(9) =4042753a(10) =30808064a(11) =235778049a(12) =1810915328a(13) =13951401985a(14) =107765334016a(15) =834322202625
External references
- oeis: A369325