A004161 Tetrahedral numbers written backwards.

0, 1, 4, 1, 2, 53, 65, 48, 21, 561, 22, 682, 463, 554, 65, 86, 618, 969, 411, 331, 451, 1771, 4202, 32, 62, 5292, 6723, 4563, 604, 5944, 694, 6545, 4895, 5456, 417, 777, 6348, 9319, 889, 6601, 8411, 14321, 44231, 9141, 8151, 51261, 69271, 42481, 691, 52802

Offset

0,3

Comments

Sorted: 0, 1, 2, 4, 21, 22, 32, 48, 53, 62, 65, 86, 122, 307, 331, 411, 417, 451, 463, 554, 561, 604, 618, 682, 691, 694, 777, 889, 969, 1771, ..., . - Robert G. Wilson v, Feb 24 2010

Links

Alois P. Heinz, Table of n, a(n) for n = 0..10000

Maple

a:= n-> (s-> parse(cat(s[-i]$i=1..length(s))))(""||(binomial(n+2, 3))):
seq(a(n), n=0..50);  # Alois P. Heinz, Apr 09 2015

Mathematica

f[n_] := FromDigits@ Reverse@ IntegerDigits[n (n + 1) (n + 2)/6]; Array[f, 49] (* Robert G. Wilson v, Feb 24 2010 *)

Crossrefs

Cf. A000292.

Sequence in context: A265178 A159766 A280284 * A303141 A246070 A202778

Adjacent sequences: A004158 A004159 A004160 * A004162 A004163 A004164

Keyword

nonn,base,look

Author

N. J. A. Sloane

Extensions

a(33)-a(49) from Robert G. Wilson v, Feb 24 2010

Status

approved