A177321 Number of permutations of n copies of 1..9 with all adjacent differences <= 1 in absolute value.
1, 2, 416, 664958, 1792874048, 6232521421502, 25328979140590460, 114573118435555703030, 560523113474283819256640, 2911820015993491302722966990, 15861703283168731825003935183416, 89796737967084981726163781067177194, 524830705066715697873367329722967841532
Offset: 0
Keywords
Links
- Andrew Howroyd, Table of n, a(n) for n = 0..100
Crossrefs
Row n=9 of A331562.
Extensions
a(0)=1 prepended by Alois P. Heinz, Jan 20 2020
Terms a(6) and beyond from Andrew Howroyd, May 15 2020