A026293 a(n) = T(3n,n), where T is the array in A026268.

1, 2, 14, 106, 834, 6732, 55289, 459742, 3858524, 32618022, 277326906, 2369003910, 20315879480, 174798617778, 1508225204024, 13045333585950, 113076177711662, 981982906771978, 8542048596893910, 74416362792323370, 649168980344148876, 5669882132589477798

Offset: 0

Author

Clark Kimberling

Keywords

• nonn

Extensions

a(5) corrected and more terms from Sean A. Irvine, Sep 24 2019