Triangle of Stirling numbers of order 3.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =10a(5) =1a(6) =35a(7) =1a(8) =91a(9) =1a(10) =210a(11) =280a(12) =1a(13) =456a(14) =2100a(15) =1a(16) =957a(17) =10395a(18) =1a(19) =1969a(20) =42735a(21) =15400a(22) =1a(23) =4004a(24) =158301a(25) =200200a(26) =1a(27) =8086a(28) =549549a(29) =1611610