Number of compositions of n into exactly n nonnegative parts <= five.

Terms

a(0) =1a(1) =1a(2) =3a(3) =10a(4) =35a(5) =126a(6) =456a(7) =1667a(8) =6147a(9) =22825a(10) =85228a(11) =319683a(12) =1203632a(13) =4546270a(14) =17218995a(15) =65372310a(16) =248705155a(17) =947926359a(18) =3618884895a(19) =13836004764a(20) =52968655260a(21) =203022926480a(22) =779008308235