Boustrophedon transform of A068717 with A068717(1) = -1 instead of 0.
A068718
Boustrophedon transform of A068717 with A068717(1) = -1 instead of 0.
Terms
- a(0) =1a(1) =2a(2) =2a(3) =2a(4) =8a(5) =25a(6) =90a(7) =404a(8) =2055a(9) =11792a(10) =75053a(11) =525622a(12) =4015361a(13) =33231679a(14) =296182315a(15) =2828335731a(16) =28809181418a(17) =311788442591
External references
- oeis: A068718