Irregular triangle of multinomial coefficients, read by rows (version 1).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =4a(8) =3a(9) =6a(10) =1a(11) =1a(12) =5a(13) =10a(14) =10a(15) =15a(16) =10a(17) =1a(18) =1a(19) =6a(20) =15a(21) =10a(22) =15a(23) =60a(24) =15a(25) =20a(26) =45a(27) =15a(28) =1a(29) =1