Convolved Fibonacci numbers.

Terms

a(0) =1a(1) =7a(2) =35a(3) =140a(4) =490a(5) =1554a(6) =4578a(7) =12720a(8) =33705a(9) =85855a(10) =211519a(11) =506408a(12) =1182650a(13) =2702350a(14) =6056850a(15) =13343820a(16) =28947240a(17) =61926900a(18) =130814600a(19) =273163100a(20) =564415390a(21) =1154933230a(22) =2342193350a(23) =4710707400a(24) =9401674275a(25) =18629923053a(26) =36670044621a(27) =71728832280a(28) =139485074370