Number of ordered pairs of permutations of [n] avoiding synchronous double descent pairs.
A334412
Number of ordered pairs of permutations of [n] avoiding synchronous double descent pairs.
Terms
- a(0) =1a(1) =1a(2) =4a(3) =35a(4) =545a(5) =13250a(6) =463899a(7) =22106253a(8) =1375915620a(9) =108386009099
External references
- oeis: A334412