Sum of lists created by n substitutions k -> Range[k+1,0,-2] starting with {0}, counting down from k+1 to 0 step -2.
A084081
Sum of lists created by n substitutions k -> Range[k+1,0,-2] starting with {0}, counting down from k+1 to 0 step -2.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =5a(4) =10a(5) =24a(6) =50a(7) =121a(8) =260a(9) =637a(10) =1400a(11) =3468a(12) =7752a(13) =19380a(14) =43890a(15) =110561a(16) =253000a(17) =641355a(18) =1480050a(19) =3771885a(20) =8765250a(21) =22439040a(22) =52451256a(23) =134796060a(24) =316663760a(25) =816540124a(26) =1926501200a(27) =4982228488a(28) =11798983280a(29) =30593078076
External references
- oeis: A084081