Number of even-length integer compositions of 2n whose half-alternating sum is 0.
A357642
Number of even-length integer compositions of 2n whose half-alternating sum is 0.
Terms
- a(0) =1a(1) =0a(2) =1a(3) =4a(4) =13a(5) =48a(6) =186a(7) =712a(8) =2717a(9) =10432a(10) =40222a(11) =155384a(12) =601426a(13) =2332640a(14) =9063380a(15) =35269392a(16) =137438685a(17) =536257280a(18) =2094786870a(19) =8191506136a(20) =32063203590a(21) =125613386912a(22) =492516592620
External references
- oeis: A357642