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A246322 Triangle read by rows: T(n,k) = number of neutral planar lambda terms of size n with k free variables (n >= 0, 1 <= k <= n+1). 1
1, 1, 1, 3, 4, 2, 14, 20, 15, 5, 83, 120, 105, 56, 14, 570, 820, 770, 504, 210, 42, 4318, 6152, 5985, 4368, 2310, 792, 132, 35068, 49448, 49014, 38136, 23100, 10296, 3003, 429 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..35.

Noam Zeilberger, Alain Giorgetti, A correspondence between rooted planar maps and normal planar lambda terms, arXiv:1408.5028 [cs.LO], 2014.

EXAMPLE

Triangle begins:

1

1,1

3,4,2

14,20,15,5

83,120,105,56,14,

570,820,770,504,210,42

4318,6152,5985,4368,2310,792,132

35068,49448,49014,38136,23100,10296,3003,429

...

CROSSREFS

Cf. A000108, A001791, A220910, A246323.

Sequence in context: A072565 A159672 A059114 * A166074 A225475 A259334

Adjacent sequences:  A246319 A246320 A246321 * A246323 A246324 A246325

KEYWORD

nonn,tabl

AUTHOR

N. J. A. Sloane, Aug 28 2014

STATUS

approved

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Last modified August 18 13:53 EDT 2019. Contains 326100 sequences. (Running on oeis4.)