Stirling-like number triangle defined by the sequence A000292=C(n+3,3).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =5a(5) =1a(6) =1a(7) =21a(8) =15a(9) =1a(10) =1a(11) =85a(12) =171a(13) =35a(14) =1a(15) =1a(16) =341a(17) =1795a(18) =871a(19) =70a(20) =1a(21) =1a(22) =1365a(23) =18291a(24) =19215a(25) =3321a(26) =126a(27) =1a(28) =1a(29) =5461