OFFSET
1,2
EXAMPLE
T begins:
. 1
. 2 1
. 3 5 4 2 1
. 4 2 1
. 5 4 2 1
. 6 1
. 7 8 5 4 2 1
. 8 5 4 2 1
. 9 7 8 5 4 2 1
. 10 5 4 2 1
. 11 41 31 35 59 149 112 95 107 608 770 145 109 82 16 14 2 1
. 12 5 4 2 1
. 13 10 5 4 2 1
. 14 2 1
. 15 17 13 10 5 4 2 1
MATHEMATICA
v[n_] := IntegerExponent[n, 2]; f[x_] := (3*x + 1)/2^v[3*x + 1]; s[n_] := (3 + (3/2)^v[1 + f[4*n - 3]]*(1 + f[4*n - 3]))/6; t[n_] := NestWhileList[s[#] &, n, # > 1 &]; Flatten[Table[t[n], {n, 15}]] (* Replace Flatten with Grid to get the irregular triangle. *)
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
L. Edson Jeffery, May 02 2015
STATUS
approved