a(n) is the number of top arches with length =1 for all semi meander solutions with n top arches.
A276051
a(n) is the number of top arches with length =1 for all semi meander solutions with n top arches.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =10a(4) =28a(5) =80a(6) =244a(7) =732a(8) =2320a(9) =7172a(10) =23212a(11) =73228a(12) =240184a(13) =768932a(14) =2545568a(15) =8240604a(16) =27468352a(17) =89699652a(18) =300579836a(19) =988463844
External references
- oeis: A276051