A079826 Consider the triangle shown below; sequence contains the concatenation of numbers read at a 45-degree angle upwards with horizontal beginning with the first term of a row.

1, 3, 42, 105, 1196, 21128, 2220137, 36231914, 3735241815, 5538342517, 565439332616, 785753403227, 79775852413128, 105807659514230, 106104817560504329, 1361071038274614944

Offset: 1

Author

Amarnath Murthy, Feb 11 2003

Keywords

• base
• easy
• nonn

Comments

1

3 2

4 5 6

10 9 8 7

11 12 13 14 15

21 20 19 18 17 16

22 23 24 25 26 27 28

36 35 34 33 32 31 30 29

37 38 39 40 41 42 43 44 45

55 54 53 52 51 50 49 48 47 46

56 57 58 59 60 61 62 63 64 65 66

Crossrefs

Cf. A079825, A056011.

Programs

Maple

read("transforms") ;
A079826 := proc(n)
        local L, k;
        L := [] ;
        for k from 1 to (n+1)/2 do
                L := [op(L),A056011(n-k+1,k)] ;
        end do:
        digcatL(L) ;
end proc: # R. J. Mathar, Sep 05 2012

Extensions

More terms from Jonathan R. Love (japanada11(AT)yahoo.ca), Mar 08 2007

Corrected by Kevin Ryde, Aug 23 2012